Blizzard had posted a job post looking for a FX Artist to be part of their unannounced project. From the post of job requirements, it is noted that they are looking into people specializing in mwobile games. Here’s a screenshot of the announcement which we highly suspect that a new mobile game will be birthed by Blizzard soon.
As you can see from the screenshot above, a certain skill in developing effects for a wide range of mobile platforms is needed. They have also highlighted on the “passion for creating imagery synonymous with the Warcraft IP” which would suggest that the project will involve certain Warcraft elements.
These are just speculations that there will be a mobile game project revolving around the Warcraft IP however, since there were no further announcements released we can only wait and expect something great from Blizzard. Hopefully a revelation is on its way to Blizzcon 2017 later.