A Wii 2 in 2009 is early indeed, yet we can expect that PS3 sales won't be as good as expected, so that may force Sony to bring the PS4 out as fast as possible. Possibly aided by the fact that they'll try something Nintendo-esk: no hi-tech with some kind of innovation. So it could go faster then expected.
But i expect a Wii-Lite around that time, it worked with the DS and it could work again. (besides it is possible they'll announce a dvd-wii at e3)







