There has been some contention about whether its Space Wolves or Blood Angels coming after Orks. This rumor is from someone that is claiming to have seen a new flyer. Of course I am trying to find out more information, but a flyer seen might very well be on the way.
Please remember that this is a rumor. Salt is always required.
via an anonymous source on Faeit 212
It's going to be the greenskins, then Space Wolves. The Sons of Russ will be getting their own flier, and it's sitting in the warehouses right now.