ComicsAlliance has published a comprehensive future timeline of all the superhero movies that are slated to be released over the next six years. It's a list of all the confirmed ones, too — it's still missing "one or two movies" from Marvel in 2019, apparently — and of course dates may change — but this is pretty much a locked-down list of all the awesome movies that you'll want to go and see for the next few years.
Our timeline makes the assumption that the Warner Bros movies will be released in the order listed in their press release, which seems a safe assumption. We can also assume that some of the "year unknown" movies on the bottom tier, like Thor 3 and Gambit, may eventually be placed in some of the existing slots in the timeline, and that Marvel Studios, Fox, and Sony Columbia will announce further dates in 2019 and 2020.
Make sure to check out the entire story, with their analysis, here.