Sting posted a date on his twitter account:

"07.14.14" at 3:07 AM - 9 Jul 2014

That date is Monday 7/14, which is a Raw taping in Richmond, Virginia at the Coliseum.

It's possible that Sting could be teasing a Raw appearance, but it seems more likely that the date could be the beginning of a promotional push for Sting's inclusion in the WWE 2K15 video game.