People have spotted a display at Gamestop advertising "Overwatch: Origins Edition".
Here's the display:
There are PS4 and Xbox One logos on it. What's more, people have been able to pre-order it. The pricing is a bit up in the air; some sources say $60, others say $40. The "Origins Edition" part seems to provide more evidence towards the game being F2P.
As somebody who was very interested in Overwatch when it was announced, I'm pretty excited for this. Blizzcon 2015 is tomorrow, so I'd expect official confirmation then.
EDIT: Battlenet just leaked it with a header. Here:
And here's the contents of the Origins Edition:
Source: https://www.reddit.com/r/Overwatch/comments/3rpc8d/just_a_little_look_into_the_origins_edition/
It's definitely happening.