I mentioned in Friday's installment of Ask WNW that I would have more on Sting's situation with WWE. I'm told the 07.14.14 cryptic Tweets are related to WWE 2K15 and there are plans for a trailer to be released on that date.
As you can probably imagine, there are plans for Sting to be available as a playable character in the game. Whether or not he'll be available as pre-order DLC remains to be seen (Ultimate Warrior was available as DLC for those that pre-ordered WWE 2K14).
Some people are speculating that Sting's Tweet means he'll be at Monday Night Raw in Richmond, Virginia next week and while that's possible, the WWE 2K15 trailer is the reason for the Tweets. As of early Friday morning, Sting was not scheduled for Raw.