A Microsoft contest appears to be hinting at upcoming EA and Turn 10 Studios reveals. The Xbox E3 2013 Media Briefing Twitter Sweepstakes encourages fans to tweet at @EA, @Xbox, @PlayXBLA and @Turn10 (an account unrelated to Microsoft, likely a typo) in order to win entrance to Microsoft's E3 press conference via separate prize pools.
The contest began on May 8 and ends on May 20, just one day before Microsoft's Xbox reveal event. The natural speculation here, of course, is that Electronic Arts will reveal a next-generation Xbox game alongside whatever Turn 10 is developing -- presumably Forza Motorsport 5.
Recent rumors suggested that Respawn's unannounced game, published by EA, would be an Xbox exclusive. Debuting at Microsoft's May 21 event would be beneficial regardless of exclusivity, however -- competitor Infinity Ward's mulitplatform Call of Duty: Ghosts is the only confirmed software for the event.
Meanwhile, Forza Motorsport 5 has long been rumored to be an Xbox 720 launch title.
A Microsoft representative stated on the matter, "Microsoft does not comment on rumors or speculation," and followed up with "We're excited to share more about the new generation of games, TV and entertainment at E3, but have nothing further to share at this time." Electronic Arts has yet to respond to IGN inquiry.