Yeah, the remixed soundtrack and animated cut scenes are from the PC/PS/SS version of X3.

I own X1 and X2 for SNES, X4 and X5 for PS, and I've played X3 on an emulator. Therefore, the only incentives for me to get the collection would be X6 and Battle & Chase. Now, I could find a used copy of X6 for ten bucks if I cared to look, but I have it on good authority that it's crap anyway. And a Rockman racing game doesn't inspire a whole lot of desire in me, either.