Though as to what sort of game it will be is anyone's guess. With Diablo Immortal being a proper Diablo game (and coming to PC) odds are this will be something substantial too. Plus, there's Hearthstone - which is a game that found massive success on mobile. The reveal is happening Wednesday May 4 at 3:00am AEST via reveal.blizzard.com
Unlike Hearthstone this is something that was "designed from the ground up for mobile devices". Here's the tease, which again, doesn't give away anything.
The Warcraft universe continues to capture imaginations across the globe with enlightening experiences and immersive gameplay, that are the foundation for World of Warcraft and Hearthstone. We are happy to present a new mobile game for the heroes of Azeroth looking to play on the go, and we can’t wait to get it into your hands.
We'll of course have more once the reveal takes place.