For what it's worth, Shimomura has almost exclusively used the Tokyo Philharmonic in the past, so I'd be very surprised if this was 15.
Oh, didn't know that about Shimomura for sure, although it sounds familiar. They also recorded for KH II.5 not long ago, although that's a remaster, so whole different thing.
Actually, I was starting to think that this, if anything, might be Type-0 rather than XV (or a whole different game, sure). I just hope they don't use Type-0 (because, as good as it may look it's still a remaster) as yet another excuse to relegate XV news. I had enough with Waifu Returns
Anyways, keeping expectations very low. I really doubt we'll get anything tomorrow and as for TGS itself... I don't know, I guess the good (and sometimes bad) thing about Japanese events and games is that leaks are less likely to happen, so we'll have to wait!
PS: the new XV domain definitively gives good vibes, although it's probably nothing.