Ok, I will type this out again at home this time.
There are 4 classes Warrior, Cleric, Mage, Rogue. Each class can have up to 3 souls (talent lines) and each chooses from a pool of 8. For example I was a Marksman/Ranger/Bard and those are in the Rogue class.
The more points you put in a talent the more attacks/actions are opened ie: I put 12 talent points into bard and that gave me 6 bard spells along with the talents I put points in ( see soul planner
http://rift-planner.com )
This gives the freedom for each class to play different ways as you get to save 3 specs and 1 pvp spec per toon which you can switch to anytime as long as you are in a city and out of combat. Next beta i'm rolling a Cleric Justicar which is a melee tank/healer should be fun.
The next is the rifts, a rift is a dimensional tear that can happen anywhere anytime in the game. If a rift is left it will open on its own and grow in size spawning mobs, taking over towns (Making quest givers leave town until its gone. These rifts are similar to Warhammer public quests where the more you participate to close the rift (Stages) the better loot you get. Rifts are soloable as they increase in power with the number of people in the area. Rifts will open on their own over time but can also be opened by players when found.
This game has the usual Dungeons and raids along with PvP warfronts (Battlegrounds)
Its worth looking into and was really fun to play in beta. Like I said the class combinations are my favorite along with the random rift events.