First we have trainer lineups, including what we all care about, gym leaders and the E4. Seems like the gym leaders have the same teams as in Ruby and Sapphire, because fuck Emerald (that's the word of the day, it seems). Well, the first three gyms have lower levels than before (as hinted by Brawly's Makuhita), Flannery and Norman are about the same, and the last three are higher. So it seems like the level curve may be altered a bit.
As for the E4, their levels are also higher, and they progress the later you get, so it seems like the old method of fighting them in a fixed order is back. Sidney has the same lineup, Phoebe swaps one of her Dusclopses for a Dusknoir, Glacia replaces both Sealeos with two Froslasses (which means FOUR Pokémon in the same evolutionary line!), Drake replaces his Shelgon with a Kingdra, and Steven stays the same, culminating with a level 59 Mega Metagross (FUCK). No word on his Aggron's moveset so far.
Also interesting is the fact that non-Hoenn Dex Pokémon were found in trainer lineups, but scrolling through the text file I've only found them in rematches so far. I'll see if I can find anything that's NOT a rematch, because if there isn't then it may still mean the Hoenn Dex isn't getting expanded. I'll get back to you on that later.
Edit: Okay, so those Pokémon are all rematches or what appears to be post-game content (including the S.S. Tidal)... except for ONE trainer in Victory Road who has a Darmanitan. What is this I don't even.
Also, E4 rematches confirmed?
Sidney: Scrafty 70, Shiftry 70, Sharpedo 70, Zoroark 70, Mandibuzz 70, Mega Absol 72
Phoebe: Banette 71, Mismagius 71, Drifblim 71, Chandelure 71, Dusknoir 71, Mega Sableye 73
Glacia: Abomasnow 72, Beartic 72, Froslass 72, Vanilluxe 72, Walrein 72, Mega Glalie 74
Drake: Altaria 73, Dragalge 73, Kingdra 73, Flygon 73, Haxorus 73, Mega Salamence 75
Steven: Skarmory 77, Claydol 77, Carbink 77, Aerodactyl 77, Aggron 77, Mega Metagross 79
Wallace also has an alternate roster (under the trainer class "Sootopolitan") that matches what he had in Emerald.
And speaking of Wallace, WHAT THE HELL HAPPENED TO YOU MAN?
Edit 2: Additional superboss... WALLY?
Roserade 79, Talonflame 79, Azumarill 79, Magnezone 79, Garchomp 79, Mega Gallade 81
Also, movesets for important trainers are now up. Steven's Aggron knows Earthquake, Stone Edge, Iron Tail and Dragon Claw. Dammit, there goes the joke.
Also, here's some really good news... MAY DOESN'T QUIT HALFWAY THROUGH! The final fight with her features a level 50 fully evolved starter... mega evolved!
Edit 3: Fun fact: The so-called "Mega Hoopa" only has stat boosts that add up to 80 points, suggesting that it might not be, in fact, a mega, and instead an alternate form. If that's the case, then Magician makes a lot more sense (as long as the form change isn't a Giratina type of deal, of course). The Pastebin file even refers to it as "Hoopa-?" instead of "Hoopa-M". Stay tuned.