So far, I believe it's only a matter of time before we see them in warcry in some fashion which is where I think we'll get the first new models for them. Personally I reckon we'll see them as a warband box similar to these new aelves possibly themed around them being a rag-tag mercenary unit made of humans, aelves and duardin either from one or a number of different realms or maybe spec ops from a specific city (probably Hammerhal) so that these brave men and women venturing into the heart of chaos makes sense (either seeking riches or being duty bound). They are so ingrained in the lore that I sincerely doubt they will ever get rid of them plus sometimes it's cool just playing regular dudes instead of demi-gods or bloodthirsty aelves, I mean look at how popular the Imperial Guard/Astra Militarum are in 40k.