There's a series of youtube vids of them in the studio making the album, some of the riffs they were fooling around with are *heavy* and very much Cantrell/signature AIC. Duvall does seem to have some guitar chops too, he's played lead guitar in other bands. If they can incorporate a bit of a twin guitar attack for this album, that could be interesting.
My expectations for any old groups trying to re-form are always low. Usually it sucks, sometimes I'm pleasantly surprised, and occasionally I'm really impressed. My hopes are somewhat higher for this, I think it'll at least blow away the copycat shit that AIC unfortunately spawned in the late 90's/00's, whatever that's worth.