Battlefield 4: "Big announcements are coming soon"
We know that the next-gen Xbox reveal taking place tonight will show off next-gen FIFA and next-gen Call of Duty, but we expect that many of the big game announcements will be left for Microsoft's E3 press conference. But it could be that we'll find out something about Battlefield 4 at the imminent event.
Now, let us to refer back to a relevant February rumor, which said that EA and Microsoft were working on a deal to produce exclusive games for the new platform, along with some exclusive or timed-exclusive DLC for multiplatform games. Our best guess would be that Microsoft landed temporary exclusive windows for Battlefield 4 DLC, much as the PlayStation 3 had with Battlefield 3 content.
Or, this could be something else, and this tweet's proximity to the Xbox event could be a coincidence. In which case I would have no guesses as to what this would be about.