Xbox One fails to beat PS4 a single week despite launching in multiple countries.

[Protendo]

I think Halo week is Xbox One's only chance. The problem is:

1.) Halo isn't as big in Europe or the East
2.) It's a remake/port
3.) The new content won't hit 1080p

I think it's Microsoft's best shot, though I wouldn't be surprised if Sony has exclusive marketing rights to GTA and decides to heavily promote it to counter. The following week will be Sony's with the rumored marketing exclusivity of Grand Theft Auto including the bundle, and next-gen exclusive Little Big Planet 3 both releasing the following week. If Microsoft does manage to beat it, I wouldn't be surprised for Sony to make both of the bundles include the title for free to counter Microsoft.

Still it should be a great year for both in sales.