So, I was looking at the playtest packet and I noticed the flavor text for humans seems to mostly replicate the 3rd edition version of humans, as versatile, innovative, and cosmopolitan, sort of the Star Trek version of humans. Whereas 4e gave humans an ambition that could lead them to nobility but also to a lust for power; call this the LOTR version of humans. I have no idea if the stuff in the packet is the shape of things to come. However, if anyone is making decisions on such things right now, I generally prefer the 4e human. It's less wibbly, offers a stronger hook, and gives other races reasons both to admire and to fear humans. Ideally, I'd like to see the concepts combined in some way, linking the human trait of adaptability with human ambition. However, if I had to choose one or the other, I prefer LOTR humans to Star Trek humans in my D&D.