If I'm understanding you correctly - what you are looking for is a detailed analysis of how the classes play? As in, you want to see the Sith Sorcerer trees, see the skills, etc. If that's what you are looking for, then - game is still in Beta, and it is still being fine-tuned - those trees, as they stand now, are not necessarily what you will see in the game. Even then, I have found sites that do have some of that information out there (just don't trust it, because until they release it officially, I promise you it IS changing)
If you are purely looking to see a basic of which class is ranged dps/ melee dps/ heals / tank - seriously, that is in the huge ass thread, and all you have to do is open it, click CTRL + F and search on the word "class"
Copy/Pasted from that thread:
Republic
-Jedi Knight:
Jedi Sentinel (Roles: Close Range Damage Dealing. Wields dual Lightsabers)
Jedi Guardian (Roles: Close Range Damage Dealing, Tanking. Wields a single Lightsaber)
-Jedi Consular:
Jedi Shadow (Roles: Close - Mid Range Damage Dealing, Tanking)
Jedi Sage (Roles: Mid-Long Range Damage Dealing, Healing)
-Trooper:
Vanguard (Roles: Close - Mid Range Damage Dealing, Ranged Tanking)
Commando (Roles: Mid - Long Range Damage Dealing, Healing)
-Smuggler:
Gunslinger (Roles: Mid - Long Range Damage Dealing, wields dual pistols)
Scoundrel (Roles: Close - Mid Range Damage Dealing, Healing, wields scatter gun)
Empire
-Sith Warrior:
Sith Marauder (Roles: Close Range Damage Dealing. Wields dual Lightsabers)
Sith Juggernaut (Roles: Close Range Damage Dealing, Tanking. Wields a single Lightsaber)
-Sith Inquisitor:
Sith Assassin (Roles: Close - Mid Range Damage Dealing, Tanking)
Sith Sorcerer (Roles: Mid-Long Range Damage Dealing, Healing)
-Bounty Hunter:
Mercenary (Roles: Mid - Long Range Damage Dealing, Healing)
PowerTech (Roles: Close - Mid Range Damage Dealing, Tanking)
-Imperial Agent:
Sniper (Roles: Mid - Long Range Damage Dealing)
Operative (Roles: Close - Mid Range Damage Dealing, Healing)
http://www.swtor.com/news/blog/20110408
http://www.swtor.com/info/systems/advanced-classes
http://www.swtor.com/info/holonet/classes