It will likely happen given the strength of the Wii platform and its perfectly suited control input.
Factor 5 would be ideal for development but Hudson and others are competent enough to do a faithful entry to the series.
As for PW 64 on VC, I'd guess it's being held onto as a coincidental release with PW Wii such as other games with Wii updates have done/are expected.
The rEVOLution is not being televised