No way, no how. It is not gonna have wifi. There is no reason for it to have wifi. It will not run the web, email or any other net utilities. If you want a device that does all that, it already exists, it's called the iPhone.
The next iPod will have full sized wide screen, multi touch interface, have coverflow, maybe run games, etc. The iPod moniker is always going to be for a media entertainment-only device, not an internet device. End of story.
True the iPhone is out there, but not everyone wants to get the iPhone. There are many people out there that will not ever get the iPhone because of one reason or another, those are the people that are wanting a REAL 6G iPod with all the nice toys that the iPhone has. I will not ever have an iPhone until they get onto a real network (AT&T blows around here) and get some good storage (greater than 60gb). To me the iPhone should be the all around mobility tech device, but it can't be as long as it has small drives and only one one network. This is all my $.02 so I am sure that I will be flamed a little by the iPhone lovers but there will be more out there to agree that the next iPod has to have WIFI to be worth anything in the new world of mobile medai players. If Apple doesn't do it now then they will miss out on the next logical move for media players.
Christopher