She’s the 23rd Character to Hit Overwatch
This is all but confirmed at this point. When Ana’s origin trailer was first released, sharp-eyed fans quickly found lines of code hidden in the trailer. These were numerical codes that could only be deciphered with the number key of 23. When deciphered, the codes delivered the message: “She who has the information, has the power.” There was no direct reference to Sombra here, but if the previously presented evidence is to be believed, this message has to be related to her, considering her background as a skilled hacker who can get into any database.
Since Ana Amari was the 22nd character in the roster, and coupled with the fact that the number key of 23 was required to crack the code, we can only assume that Sombra will indeed be the 23rd character to be added into the game.
Of course, all of this is just wild speculation with no official confirmation from Blizzard. However, we do know that Blizzard is teasing something, and we’ll be seeing a new character in Overwatch sooner or later.