They're not going to make classless DnD. They're going to use their base mechanic and modular system--with it's unified character progression--and set out the character classes and other elements which they feel embody DnD and its heroic fantasy style of play.
What's nice, though, is that the rules seem as though they'll be very modular and the system transparent enough for a DM to tinker around and tailor everything the way he wants. It's potentially a lot more freedom than we've ever had before (for the amount of work it would take, I mean). It's all still DnD .... until you make it something else. That you can do so without spending three months in a Tibetan cave chained to a computer with a host of playtesters at your disposal is nice.
I wouldn't expect any support except for the core assumptions of the game--heroic fantasy--as laid out in the PHB, DMG, and MM, though. Maybe in a future supplement or article. Some exciting potential, though, IMO.