It appears that there are almost no new tutors this time around, just old ones, so the first five gens should remain unchanged. But old or not, they're a godsend to many of the gen 6 Pokémon (I get my Knock Off Malamar, for instance). You can see the raw file here, and the list of tutor numbers at the bottom of this post.
There ARE a few level-up/egg move changes though, such as Boomburst Flygon, Water Shuriken Accelgor and Spiky Shield Maractus and Cacturne.
Edit: Crunch Gyarados also confirmed, so at least its mega will be able to use dual STAB decently. Whether it actually will is another matter entirely.
Also, Dark Pulse is going to be BOTH a tutor and a TM. Let's recap, shall we? There's that, no customization (although I don't really care, I still don't buy their bullshit excuse), probably no Hoenn Dex expansion, probably no Battle Frontier, no patch for X/Y, and MAGICIAN FUCKING MEGA HOOPA. This remake just SCREAMS "rushed" at this point. The game isn't even out yet and it feels unpolished as hell. Remakes don't seem to be Gamefreak's thing, are they? You know how when talking about Sonic, people say Colors and Generations were good by accident? Are we going to be saying the same thing about HGSS?