^Eh, the OP isn't bad, IMO. And yeah, the theme does sound like a new one. Honestly, I would've preferred the Dawn of Ys arrangement myself, but I think this one does the job nicely. But then again, maybe the Falcom JDK Band was too focused on the OST for the PSP's Nayuta to make Celceta's new music sound even MORE awesome.
BTW, I hope Celceta has the option to switch between different versions of the soundtrack like Chronicles and Felghana did (so we could switch between the PCE and SNES versions of the OST)....