If they are willing to do another Hot Rod (Rodimus without the trailer) just so that it is now in scale with the new run of Masterpiece toys (especially Ultra Magnus), I guess it leaves the door open for a second Megatron... who would be more popular than Hot Rod, out of the ones that have already had the Masterpiece treatment.
Of the "old scale" Masterpiece toys...
MP-01 - Convoy/Optimus - already redone in the new scale
MP-02 - Ultra Magnus (pfft
) - already redone in the new scale
MP-03 - Starscream - scales well with Soundwave, but could get a slightly smaller version, and then accommodate the coneheads in the new design
MP-04 - Convoy with trailer - already redone in the new scale
MP-05 - Megatron - out of scale, needs to be redone in the new scale
MP-06 - Skywarp - (see MP-03 Starscream) (a new seeker mould would guarantee at least 3 versions if not reworked as coneheads)
MP-07 - Thundercracker - (see MP-03 Starscream)
MP-08 - Grimlock - can still count as being in-scale with the new range, as Cartoon Grimlock was massive compared to the regular Autobots.
MP-09 - Rodimus - out of scale, and looks to be getting redone in the new scale
Then from MP-10, the series was rescaled and given a more uniform scale to the cartoon... so if Hotrod/Rodimus is redone, it just leaves Megatron as the
really odd one out. (and if they can successfully sell a second Hotrod, TakaraTomy should be able to make and sell enough Megatrons to the restricted markets from their retailer-customers, to be worth a second version)