Like many other companies that sell video games, this is most likely nothing more than their best estimate as to when the game might come out. I doubt that they have inside information from Blizzard as to when it will be released. Hell, I doubt even Blizzard knows when D3 will be released other than a few month time window.
I doubt this
Also while I was looking at the picture it looks like that person is holding a bow....Now it might just be a merc or it could be a zon...who knows
O and we already know that the barb is the only returning character from Diablo II.