Because of Halo MCC or because of desperation price cuts?
Because honestly, I don't think either of those factors are particularly compelling, and certainly not enough to make it a lock.
Yeah, I wouldn't say its a lock either because of BF, but it has clearly been outselling the PS4 so far...
For BF you looking at:
PS4 + TLOU + GTA = $400
XB1 + ACU + ACBF = $330
(most places)
Here is what some of the retailer specific deals look like:
XB1 + ACU + ACBF + Kinect + 2nd controler = $430 (Best Buy)
XB1 + ACU + ACBF + $50GC = $330 (Target)
PS4 + Lego + LBP3 = $400 (Toys R Us)
XB1 + MCC + $30GC = $330 (Walmart)
XB1 + Kinect = $330 ( Toys R Us)
PS4 + TLOU + GTA + 2 Games = $450 (Walmart Online)
X1 + MCC + Game + 12M Live = $380 (Walmart Online)
PS4 + $50 GC (Walmart)
As you can see, X1 has more special deals planned.
It could be that MS did a lot of planning to work these out, but it is also very possible that the stores are doing this to move inventory.