I dunno who the heck suggested that next winter would see a new Xbox. Historically, a new generation of consoles has come every 5 years; it's held true since the first generation. (i.e, the Magnavox Odyssey) around 1975. And this is now the 7th generation, beginning as of 2005 with the Xbox 360's release.
Hence, it's incredibly unlikely that we'll see any new consoles until 2010. And likely, given the situations surrounding this generation, they may put it off until 2011.
As for getting an Xbox 360... As mentioned, do it PURELY for what you'd want to do on it. If there's no games for it that you really want, then buying one would simply be a waste no matter the time and price. Ditto for Xbox Live; ask yourself if you're really play enough on it to warrant the price of a typical new game ($50US) every year for the service.