There's a review [here]. It does contain minor spoilers for the game - the author reveals a couple of facts about things that *haven't* happened as far as he's got through the game, which is implied to be about halfway.
From what he writes, though, it looks very very interesting. It looks like they do some rather entertaining and intriguing things with the RealWorld / FantasyWorld? distinction. (Not that any other FinalFantasy game would do that.... *whistle*)