Jeff Kaplan just made a statement on custom maps in overwatch-
"We are extremely open-minded about releasing a map editor for Overwatch someday. But because Overwatch was made with a brand new engine, this is not a small task or one which can happen any time soon. We have this on our long-term road map and believe heavily in user-made content. But there are many challenges ahead of us and it will be a very long road before our editor can be made available to the public."
https://us.battle.net/forums/en/overwatch/topic/20753537194#post-15
I'm actually surprised about the inclusion of a map editor, and wonder how it would play out. I predict it won't be too far off from Halo's Forge mode to be more friendly, if that's what Blizzard is going for. I'm excited!
I wonder what "someday" translates into for Blizzard as opposed to Valve time.
Definitely excited about the idea of an editor. It'll be very different mapping for OW as opposed to TF2, so a lot of preconceived notions we have had hammered into us about mapping will need to be rethought entirely from the ground up.