Talking on Discord about it, and it has monophonic bass and synth structures with the same chromatic sequencer and pad mode as the XT. You can see it in the sound demo towards the end.
Expressiveness quote shared: “They’re not wrong about the ‘expressive’ part. There’s 2 slots of velocity and 2 slots of aftertouch and a loop able modulation envelope available per channel. 69 destinations available, but as with the Ambient 0 it uses Structures so it depends which structure you’re using as to which destinations work. There’s multiple structures for some drum types, classic, FM and metal for kicks for example”
The distortion on the amp envelope looks fun. And each track can be any engine with the exception of the open hihat and cymbals that can only be the last two (but they can be replaced with the other engines). So you could have 8 tracks of Toms if you wanted.