Well, I can't say that I was expecting Overwatch or even a game like Overwatch to be announced at BlizzCon this year, but I was really hoping that new intellectual property would be announced and that is exactly what I received I guess. I am pretty sure that the last new piece of IP released by Blizzard was Starcraft and that was released what, 16 years ago and change? So even if it is obviously a Blizzardified Team Fortress 2, having someone break out of the sequelitis plague makes me happy. I am also pretty curious as to how much of Overwatch was originally the now defunct Titan if any.
I like the basic premise and the art style, particularly the character designs. However, I don't think that they did too good of a job making characters with a visually distinct silhouettes based off of the short preview clips that were shown. If I recall correctly, Valve specifically designed the Team Fortress 2 characters with very distinct profiles that could be seen easily from a distance, while moving at a high speed, and so forth. I guess we will eventually see how that impacts gameplay.
There is a suspicious Overwatch sized hole in my gaming schedule for a casual FPS and I haven't yet played a Blizzard game that I did not enjoy, so bottom line: Will I be playing Overwatch? Sure.