Good news for the people that are waiting for Overwatch!
As i was checking reddit today i came up to this (Click Spoiler):
The image appears as an advertisment on IGN.
So as you can see,
-Release Date is on : 24/05/2016
-Early Access starts on : 03/05/2016
Although we are still waiting for Blizzard's Overwatch Team Twitter or a Blue Post
to confirm this.