A trailer for Heroes of Mana has been released, and the tune that accompanies it is kind of....Legend of Mana-lite. Nothing I would listen to outside a game, but it sounds like Shimomura, sure enough...
I like the idea of it being an RTS instead of yet another Tactics game, but damn does it look confusing in that video. As for the music, I can't tell if that's Shimomura or not, but it sounded like very generic trailer music, so here's hoping it's not.
Edit: Just saw this: http://www.the-magicbox.com/0609/game060924i.shtml
Note the two screens with the SD3 characters and screen layout. I'm not sure how this figures into the game, but now my curiosity is piqued more than ever (SD3 has always been my favorite of the SD series despite the language barrier).