I work at Gamestation and I've not heard anything about a 'flood' of consoles arriving soon, though I guess that doesn't mean they aren't coming. I just received my 3rd Xbox 360 this afternoon, made on Jan 10th 2006 & it has a different shaped power supply with it (still as huge but the feet are on the side so its taller than it is wide when stood properly). it seems to be working fine so far, although my first one worked flawlessly for about 3 weeks before it failed, so its no guarantee of anything, but so far, so good.
Also i say get both. COD2 is amazing online but it lags severely more than half the time, theres a patch coming soon though to fix that. PDZ is a lot of fun too & it feels quite reminiscent of Goldeneye, which can only be a good thing.