I might be wrong but it seems that "chug" might only be for FX3 if I'm not mistaken.
I can only find a few posts with user speculation, nothing official about whether chug gets ported or not. Current Cliff posts seem to concern axe fx 3, but that's been the case with many updates.
Not porting this update would be close to saying "fm3 is done with amp sim updates" or further distancing possible updates from axe fx 3 amp sims.
Which I wouldn't imagine is going to happen, at least for amp modelling. This seems to be an update that affects the quality of amp modelling along the board.
If we were talking about something like the drive block, ok. Can see more of an issue there. But that's quite a different scenario it seems to me.
Correction: i realized you were reffering to fm3 potentially getting this later on, not now. I think that's definitely possible.