Yeah, but I like dragons. As long as I'm dreaming anyway...
I reckon tapedeck Soundwave is well worth the MP treatment (so is Cyclonus, or better yet Lugnut), but HasTak has a remarkable knack for not going with what I'd like them to do - hence why we don't have a Voyager Rhinox yet. Aside from Alternators and Titaniums, Grimlock has been a T-Rex in pretty much every toy incarnation and fiction incarnation to date, including the latest entry in the new 'official' aligned continuity. Lately Soundwave seems to more often be a car, or a plane, or a space bomber, or a somewhat hentai-esque satellite. Hasbro has been asked a few times over if they'll ever make a Tape Player Classics Soundwave, and every time they've said no since the alt-mode is too outdated. MP is a slightly different kettle of fish to Classics though.
Truth be told I'm surprised we got Grimlock and Rodimus - both of whom have been repainted (Grimlock has the comic colouration, Rodimus got the standard black repaint).
It would be possible to do a Toy colours and Cartoon colours repaint and I'd love to see it, but when they could do Ironhide/Ratchet,LamborSideswipe/Sunstreaker/Red Alert, and/or Prowl/SilverBluestreak/Smokescreen, not to mention just churn out Thundercracker and Skywarp Mk II along with some slight remolds to bring out the coneheads...poor Galvy just doesn't seem to be where the money's at. I'm not saying it's impossible, just really unlikely.
Of course, it's Takara who makes the MPs for the Japanese market, so if Galvatron's a sufficiently popular character here who knows? Besides the ubiquitous Prime, Bumblebee and Meister I'm not really sure who ranks up there in the Japanese favourite stakes.
As far as requests for 2013 goes, here's an angle to help us get a Rhinox: they could easily do G1 Headstrong, Ramhorn and (probably Botcon Exclusive) Stranglehold repaints/remolds.