Don't know if this is news but....
There is a picture of a WD floating around the internet saying 3 things:
1. Faster than the eye can see
Eldar Jetbikes. Definitely.
2. The dying return
The Eldar are known as "the Dying" for one thing. Furthermore, this could easily mean the wraith contructs, but I think then it would say "dead."
3. Forge world
Well, if it isn't more stuff for AdMech, then it's just another Forge World expansion or book or model or something.
To me, this all points to an Eldar release, possibly Siam Hann focused, with some kind of Forge World campaign or something to accompany it.