Of course. All the WFB armies are at least getting a pdf update, as far a I can tell, less going waaay back like slann.
But they are just basic thing so you can use your old army. The armies arnt in TOW. They are not being supported.
Don't expect pages in the new rules and fluff dedicated to Skven or the other old races.
In the future? Maybe, but if it flops, maybe not.
I suspect cities of Sigmar and any Empire, elves, so on releases will show us how GW will treat the divide going forward.
Expect very contrasting armies. Orcs-urakzimawhatzamadoozies, undead-nighthaunts, so on.Skaven still use WFB figures for Aos, so expect Aos revamp if they are ever done for TOW.
The PDFs are just to get people with existing, or proxy, armies to be able to buy the new rules and play. GW will be hopeing they will then buy a new army for it at some point. Anything to get them to play the game.
Was just in GW and staff are being treated like mushrooms. Knew less than me about it.