Still no rom leak. Though its possible it comes today at some stage. The game is released in a day and a half.
So far the gyms look the same. Elsewhere this has people disappointed. Serebii exclusively released information. Seems legendary pokemon from 3rd generation are available as well as the legendary birds from FR/LR and D/P/PT. Also no Jirachi (but Japan had that event) and no Deoxys. It seems we are able to pick up a FR/LG starter and a Hoenn starter.
Snorlax can be seen outside Diglett's Cave at Level 50 and Red is in Silver Cave again. In terms of a difference. You need to defeat Monks before you reach Falkner's cave.
In terms of the Gyms. A player posting at 2ch is through to Jasmine. Rossymore posted the first few gyms on the site. To be honest I don't actually find it newsworthy enough to post and I'd sooner know more about the gyms. For instance the trainers inside those gyms etc.
But gym leader details.
Falkner: Level 9 Pidgey and Level 13 Pidgeotto. Reward is Roost.
Bugsy: Level 15 Metapod, Level 15 Kakunam and Level 17 Scyther holding a Sitrus Berry. Reward is U-Turn.
Whitney: Level 17 Clefairy and Level 19 Miltank holding a Lum Berry with the attacks; Attract, Stomp, Milk Drink and Rollout. The TM Attract is rewarded.
Morty: Level 21 Gastly, Level 21 Haunter, Level 23 Haunter and Level 25 Gengar holding a Sitrus Berry. Shadow Ball TM rewarded.
Chuck: Level 29 Primeape with Double Team, Leer, Rockslide and Surf. Level 31 Poliwrath with Hypnosis, Body Slam, Focus Punch and Surf holding a Sitrus Berry. TM Focus Punch rewarded.
Jasmine: Level 30 Magnemite, another Level 30 Magnemite and Level35 Steelix holding a Sitrus Berry. TM Iron Tail is rewarded.
Sources: 2ch. Pokebeach and Serebii.net.
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I don't actually find Gymleader details that excited. I'd sooner know where the pokemon are etc. I hope to make the Gymleader page when I get hold of a game. Because I want more details than what is available and I don't want to rely on either of those three sites anyway.