Golly, and let's look at what they have in-store for the rest of the year: Windows 10, DirectX 12, Halo 5 and Surface Pro 4 (rumored).

Then their is that little think called a HoloLens. They are off to a great start!

Apart from Halo 5, will any of those help the X1?

Probably.  With Mircasting, game caputure, and multi playform gaming as in Fable Ledgens, and Xbox One became more useful as a broadcase and streamer game maching.  Plus with Window 10 it gets universal apps so it will have even more things to do on it.  Plus any apps you like in Window 10 can show up on your TV easily.

DirectX 12 will help the Xbox One and Window 10 with a unifide development platform.   It also looks as if the Xbox One will get a signifant performace increase, but that's just speculatoin at this point.  Just seems very likely in all the senarios.

HoloLens?  Who knows - probably as it should work with an Xbox One, but no idea when it will come out at all.  Might not be this year.

Surfae Pro 4, nope got me there.  Just saying that should be a good thing for Microsoft and Intel.  It will be significantly more powerful with a longer battery life.