>>21766789WILL UPDATE AS MORE CONFIRMED
Here are the facts so we know at present.The Mexican and the Chinese leakers have uncovered:
* Mexican Leaker has Sapphire , Chinese Leaker Ruby (I think)
*You start the game playing a Gameboy in the back of a van
* Local Wireless Contests with other players
* Zinnia is seen disguised in your version teams outfit (possibly spying on them)
* Alakazamite found
* Mawilte found
* Aggronite found
* Manetricite found
*Unknown if stones are version exclusive
* Machoke are the removal men.Not Vigoroth:(
* Mauville City is huge and looks like a shopping mall-it appears you can bike around it
*Cafes are back (possibly restaurants too)
*Mexican leaker is the furthest ahead so far
*No sign of Scott yet:(
* The Ultimate/Pledge Move Tutor is in Mauville
* Moss Rock is in Petalburg Woods
* You can rebattle NPCs
* Flash is no longer a HM
* Hoopa is tradeable and able to battle online
*Lati Mega Stones and Soul Dew are now tradeable online
*O-Powers are back
From the IGN review:
* Wondertrade is back
* The Lati Twins can be called upon at anytime to "Soar"-meaning once you get them,tehre is no need for a party Pokémon with Fly.You don't even need the Lati in your party
* Mention of post game content- DOES NOT SAY IF THIS IS BATTLE FRONTIER
Rumoured:
*Battle Mansion returns with a second Daycare Centre
* No Battle Frontier, but NPCs dialogue suggests its coming (possible day one DLC?)
* NO HIDDEN MEGA'S-
http://www.neogaf.com/forum/showpost.php?p=139379635&postcount=44 
