PO engines in OP-Z?

So, I vaguely recall a very early interview about the OP-Z w/ one of the TE folks suggesting that a number of Pocket Operator engines would be in the OP-Z (in addition to the OP-1 ones). Having seen now that the OP-Z is going to software expandable, likely through additional purchases, what are the odds that all the PO synths/engines can now be ported as plugs to the OP-Z. Is there any hardware limitation that would rule one out? Anyone have any update as to the likelihood of this playing out?