The next installment for the Age of Sigmar is looking going to be the Destruction Grand Alliance with Orcs and Goblins taking center stage according to the latest whispers.
Please remember that these are rumors at this point. It does seem likely that this could be coming right around the corner in March. I have no reasons to doubt this source.
via anonymous sources on Faeit 212
Orcs and Goblins / Destruction in March are the next release for Age of Sigmar.