I highly doubt the armour on ex df2 will be removed. It's slow and its armour is easily broken. It is a launcher yes but it's incredibly reactable. Taking it away would hurt him a little. I'm not going to say it will ruin Butcher, because it wont but it's one of the main ways of 'getting in' against projectiles. Taking that away would leave ex db3 as the only way of getting in, and that just pushes them away more! As a variation that struggles to get in against keep-away characters, removing that tool would crush his mobility.
Of course, we'll see in a few hours what they're going to do with Leatherface. Hopefully they go in depth with his changes in the stream.