The Spider Incarnate has supposedly been ditched, as has Gallet I believe. From what I've heard said they're trying to move production away from China, why is why that one, and a few others have fallen by the wayside. There were rumours a few months ago that the existing Incarnate would be going too for that reason.
For Orruks, my assumption is that the long-yerm goal is to have Ironjawz and Kruleboyz as two completely separate factions, and at that point you probably don't want to be supporting three Orruk factions.
It will be interesting to see what the new background included in the PDFs for BoC and Bonesplitterz is. Could we see hints of potential replacements?