Here's a second video developer diary from Rift: Planes of Telara, in which the developers at Trion World Network explain how the game will not pin down players into one class. Word is: "It gives players a stellar overview of soul attunement, details about the root and branch soul tree, and some examples of the souls you can attune to (i.e. - warrior, rogue, mage, cleric). You’ll see clearly that in Rift you’re never pigeonholed with one class as the title features several exciting options for you to chose from." Here's the embedded version.