I have a bit of history with that as I worked as an on call manager with GW when the dwarfs were coming out for 8th ed.
I say with confidence that all the newer (gyrocopter, longbeards, ironbreakers, runelord etc) will stick around.
The issue of square bases is delt with by just including a circle base, they did it for some seraphon stuff and the lore master from Eldritch council
I hope that the warriors get a new kit but seeing how they’ve already been reboxed twice it wouldn’t surprise me if they stay the way they are.
Compared to gitmob that literally didn’t have any models that were with in 7-8th ed fantasy I’m not surprised they go cut. I am surprised that they didn’t say last chance to buy though