That's clearly Ragnarok Odyssey.
Oh please be Rexx, that would be great.
They could be pulling an Atlus too, teasing it as one game but it's actually multiple.
Why wouldn't they do both versions? Make the 3DS retail and the PSP DD-only, that's what I think they'd do (as much as people would complain about the PSP version being DD-only).
Meh, vocal minorities and all that. I think they'd release it on both platforms if it's an option.