Nothing. 

And this is exactly why the X1 has been having horrid sales. Once the excluisves come around, and the Fall begins. One will improve drastically. 

Wii U has become a desirable system with the release of Mario Kart 8. The backlog of games good games helps too!

The Xbox One is at a low point, no big exclusives for months, its yet to find its footing but that change in the fall.

This is thing that so many people are ignoring. The Xbox One is selling off Titanfall (release 5months ago) and a few scraps of 3rd party releases (watchdogs, last years COD). Moving forward past september its baseline will be so much better.

The PS4 stole a big portion of the NA market which is a big problem for Microsoft. It's also under-performing in Europe. The Wii U is less expensive and has a better library built on 1st party exclusives. A SSB bundle along with Hyrule Warriors and the Bayonetta collection will carry the console throughout the holidays. I expect the gap between the Wii U and XB1 to grow by the end of the year. Japan will be a dead region for the XB1 much like it was for the 360. The XB1 is just not an attractive console.

Go Wii U!!

Exactly! I personally don't consider Titanfall to be a system-seller! :S

It maybe could have been.... if it was excluisve. ;)

Destiny, CoD, Fifa, AC:Unity

While i am not a big fan of any of those, we can't deny that those games sells consoles.

Watch Dogs increased X1 sales by 27% FW, even being in 4 plataforms+PC and being a new IP.

If Wii U had those third party, it would hold 2nd place easily, but it doesn't...

It's just the Mario Kart bump. Once that wears off, the XBO will take charge.

Wait, but everyone keeps telling me that Mario Kart didn't cause a long-term sales increase. I don't know what's real anymore.

Maybe it would have helped the X1 a bit more if it was exclusive, but still nowhere to Halo or Gears levels.. :S