Overwatch - The 27th hero is coming?

Through their official Twiter, Blizzard has mentioned what could be the 27th Overwatch hero.

The rumors were anticipated by Jeff Kaplan in the official forum, in a post titled "Can we have a hero 27 hint?"
Kaplan said: "Ok. Incoming. Brace for it..".

After that, in an "After Action Report" called "Operation White Dome", we can read a referring to a certain Emre Sarioglu, presumed a member of the Incursion team.

And now Overwatch fans are already speculating on the identity of the new hero, and whether or not it's Emre Sarioglu.