Next week? Only if MS either:
a) somehow knew Sony was going to cut the price last Friday.
b) figured Sony would cut the price at some point this season and have a full-blown response ready at the flip of a switch.
Both of those assumptions include another assumption that MS wants to cut the price before the holiday season really sets in. Either way, I imagine a big corporation like MS or Sony needs to do far more than just send out an email to retailers announcing a price cut, probably requiring at least a few weeks of organizing and communication with ad teams. A price cut to coincide with Halo 5 might be in the cards. Or Xbox fans might just have to wait a few weeks later for Brack Friday Bundurus to drop.