Wormwood
Adventurer
I've got to say, this makes me a bit antsy. It almost feels like the attitude is that those poor benighted grognards who don't want lots of options when they first roll up their character will be enticed by all the superfunoptioncandy and finally "see the light" and want to get options for their characters once they see what they've been missing.
Actually, I think this akin to the Essentials/Core paradigm: an E-class (simple, limited options) can play at the same table with a PHB-class (complex, many options).
But to Monte's point, I started my current game using Essentials (bringing in 2 newbies to the hobby, thankyouverymuch). By 5th level, the Slayer decided he wanted more options so he retconned into a Weaponmaster.
In a perfect world, I would have preferred the ability to swap class features for powers without having to start a new character. I think that's what Monte is getting at, and I LOVE it.