I think Halo 5 is sucking all the oxygen out of XB one sales now. The number of people looking to buy a Xb one right now but are not interested in Halo 5 is just really low. People are either waiting for Halo 5 or they are waiting until closer to the holidays. I think Xb one sales are going to be very low for the next few weeks, the question is whether the Halo 5 boost can make up the deficit. In theory it should, because PS4 doesn't have a AAA exclusive new release coming this month, and by the look of things PS4 won't have a price cut. So while PS4 is easily leading for the time being, it could be that sales are also on the low-ish side meaning the absolute deficit is not that big and it's easy for the Halo 5 boost to overcome it.
Halo 5 bundle has been up for pre-order for a long time. Even at a relatively low pre-order rate now it's all going to be accumulating to one big boost int he NPD numbers, along with the people who buy their Xb one on Halo 5 day one.
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