If all goes according to plan, Blizzard could be adding 3 or more maps to Overwatch by the end of 2017. Game Director Jeff Kaplan shares with fans the news in the quote below: 

“We currently have 3 maps in development, all past the initial playtesting phase that are “standard” maps (QP/Comp). While something could always change, all 3 of those are looking likely for a release this year.”

Kaplan continued stating that those 3 maps are only in development for QP/Comp and that the development team is also working on 3 more maps for another mode:

“We also have 3 non-standard maps in development (these won’t go in QP/Comp). We also have a few other experiments going on."

Who knows what other game modes Blizzard has up their sleeve for the game. Which do you think should take priority, new maps or game modes?