After doing a bit of research (a lot more will be clear once I can actually get the hands on approach), as a Juggernaut, you will be looking at the following things for tanking. I'll repeat again, the game is not released yet, this is all in theory. If you have any corrections you would like to add (I'll be adding mine in the future), please feel free to contribute. Once the game is released and more extensive testing has been done, I will be posting some more definitive information as well as builds.

Talents
As a Juggernaut, you will be split between the 3 Sith Warrior trees, Immortal, Vengeance, and Rage. Immortal will be the tree you will be putting the majority of your skill points in, as it is considered the 'Tank' tree. By looking at the tree, you should be able to get what you need on the defensive standpoint with around 27-33 points, leaving you some room to invest in damage orientated talents in the Vengeance tree or some of the utility talents in the Rage tree.

Abilities of Note
Backhand - 3AP - 4m Range - Instant - 60s CD - Bashes the target for 1024-1135 kinetic damage, stunning it for 4 seconds. This ability generates a high amount of threat. - If not for anything, the threat increase is enough to make this a staple ability.

Chilling Scream - 2AP - Instant - Freezes nearby foes, reducing their movement speed by 50% for 9 seconds. - Situational, but if you lose your grasp on a mob, it could help keep the distance to a minimum as well as keep your party a little safer.

Endure Pain - Instant - 3m CD - Temporarily increases your maximum health by 30% for 10 seconds. When the effect ends, the health is lost. - For those who've tanked in WoW, you've grown custom to such 'Oh Shit!' abilities. This is one of them. To ease the burdens of heavy damage spikes, this is an ability you should be used to using.

Force Choke - 10m Range - Channeled (Unless talented) - 60s CD - Chokes the target, crushing and stunning it while Force Choke is channeled. Deals 792 kinetic damage every second. Builds 1 rage per second. - This is very similar to Backhand except it gives rage instead of using it, and is slightly weaker to make up for it. This makes for a good opener to help generate rage.

Force Scream - 4AP - 10m Range - Instant - 12s CD - Blasts the target with a Force-enhanced scream, dealing 2198-2549 kinetic damage. In addition, standard and weak enemies are stunned and deafened for 4 seconds. - This is one of those abilities that you should have on cooldown at all times if you have the rage. This is especially true with the Sonic Barrier talent, as it provides you with a 10s shield that will make battles much easier for both you and your healers.

Intercede - 30m Range - Instant - 20s CD - Leaps to a friendly target, reducing his or her threat by a moderate amount and reducing damage taken by 20% for 6 seconds. - Another one of those panic buttons we're used to. I can see more creative uses for this as well, but I'll have to look further into the mechanics of it.

Invincible - Instant - 180s CD - Reduces all damage taken by 40% for 10 seconds. - Another panic button, this one would be best used for times where you are taking an excessive amount of damage and/or your healers are having a hard time keeping up.

Retaliation - 3AP - 4m Range - Instant - 6s CD - Retaliates against the target for 1892-2020 weapon damage. Realiation can only be used after a successful melee or ranged defense and it does not respect the global cooldown. Attacks with both weapons if dual wielding. Cannot miss, be parried or dodged. - When used with the Blade Barricade talent, it will grant you 6% increased defense against ranged and melee, just to add to the awesomeness of this move. I would use it whenever capable to have a steady increase to your survivability.

Saber Ward - Instant - 180s CD - Raises a lightsaber ward, increasing melee and ranged defenses by 50% and reducing damage taken from Force and tech attacks by 25%. Lasts 12 seconds. - Very powerful survival CD, but the most notable part of the ability is the damage reduction to Force and tech attacks, as there are far fewer ways to mitigate this type of damage than physical or kinetic. Either way, very good ability in a pinch.

Smash - 3AP - Instant - 15s CD (12s talented) - Smashes up to 5 enemies within 5 meters, dealing 1538-1889 kinetic damage. Also stuns weak and standard enemies for 1.5 seconds. - When coupled with Quake, this ability becomes a powerhouse cooldown that should be used at least every 18 seconds (making the talents to reduce Smash's CD a little less mandatory although it's still nice against large groups of trash). With Quake it makes you 5% harder to hit for 18 seconds, easing the pressure that much more from your healers.

Sundering Assault - 4m Range - Instant - 4.5s CD - Strikes the target for 814-923 damage, and reduces target's armor by 4% for 15 seconds. Stacks up to 5 times. Builds 2 rage. - Primary single target attack.

Sweeping Slash - 3AP - 4m Range - Instant - Slashes up to 5 enemies in front of you for 164 - 251 weapon damage each. Attacks with both lightsabers if dual wielding. - Primary AOE attack, and spammable to boot.

I'm not going to include every little ability you'll be using, but for the most part all I left out was abilities to taunt and abilities to generate rage such as...Enrage.

Stats of Note
This is a small list of stats you should be focusing on when setting your character up.

Armor - Reduces physical and kinetic damage.
Defense Rating - Increases parry/deflect chance.
Endurance - Increases total health.
Strength - Increases melee damage and critical strike chance.
Glance Rating - Increases chance to shield an attack.
Absorption Rating - Increases the amount of damage shielded attacks absorb.
Accuracy Rating - Increases your chance to hit with your abilities.
Critical Rating - Increases critical strike chance.
Power - Increases melee and force damage.
Surge Rating - Increases the damage of critical strikes.
Presence - Increases companion's health, damage, and healing.

Conclusion
This is all I could think to add right now (and is also pretty much all I know right now ), but if you have questions, I have no problems answering them. I'll be adding a few more things to the guide once I get my hands on the game and actually get a feel for it such as rotations and general strategies, but for right now this is what we have, hope it's been informative!