It does look pretty fun.
I know I'm usually down on 4E D&D, from what little I've tried of it. But this looks different. It looks like it's not pretending that it isn't a tactical war game first and an RPG second. And it's got plenty of 'random.' Gamma World just isn't Gamma World in my book without lots of randomness in character generation.
So I'm definitely looking forward to playing this.