I reckon there'd be a good chance for POTP combiners being under the UW banner since the Dinobots/Terrorcons/Lady Autobots aren't in the lineup for Japanese POTP (or POP? You tell me).
Atleast I hope so because I quite liked UW (and correct me if I'm wrong, but they sold pretty reasonably well?).
Also I imagine this will be a gradual change and not an absolute for TF going forward - it's very unlikely that TT would just jump ship to Hasbro's MP numbering (or vice-versa).
Again plz correct me if I'm wrong.