An update on Battle.net announces the Overwatch closed beta is going to return next month, and outlines what will have changed since the beta went offline. Here's word:

After looking through all of the feedback from last year, one of the things we noticed players consistently mentioning was their desire for more game modes in Overwatch, in addition to Point Capture and Payload. Without getting into specifics, we are working on a new game mode. And we’re very excited about it! And we have some great new maps to support it, too, but we need a little more time to get everything just right.

Rather than try to rush a beta patch out this month (which would mean the new game mode would have to be put off), we’re going to take a few extra weeks before bringing the Closed Beta back. By doing so, we can make sure we can include the new game mode along with the new maps. This will also allow us to do some additional polish to the game’s progression and reward system. Though all these features will still technically be a work-in-progress during the beta, we’d like them to be at a certain quality bar before releasing them for testing.

This was an easy choice for us to make, and hopefully this post can help you understand why we made it. I don’t have an exact date for when the Closed Beta will resume, but right now we’re looking at mid-February (and we don’t intend to slip out of February). We’ll do our best to provide at least one week’s notice before we’re ready to get this beta party started again, so definitely keep an eye on our official channels.