I'll withhold any opinions on GoW2 until I actually play it, but given the short development time, I'm only expecting a slight evolution of the game from the original.
I'll enjoy it, but will I consider it a quantum leap in game design? Not bloody likely.
Comments like that seem to be common from developers who are self styled rockstars.
Itagaki is another developer who seems to have a tough time not badmouthing anything he didn't develop himself.