I don't know AzBat, I'm kind of with ShiftyGeezer on this one.
XBox is such such a brutal money loser for Microsoft, a $50 price drop - all it really means is that they are losing an addtional $50 per console sold. And with strong Xbox1 titles that are pretty recent, I could imagine people buying an XBox in the near future would probably not participate in the Christmas Xbox 2 fun that Microsoft would much prefer.
I think that in general, XBox won't be selling too well this year, due both to pricing and channel availability, and the emphasis on XBox 2. I mean, I wouldn't even be surprised if GameCube took back it's number 2 spot in a pretty strong way this year with the Resident Evil 4 hype and other strong titles coming out (Zelda).
For Microsoft, I really feel all the emphasis is going to be XBox 2.