Heres whats been found out so far. Amended from the previous thread:
* Leakers-Mexican Leaker has Sapphire and the Chinese Leaker Ruby (I think)
*You start the game playing a Gameboy in the back of the removal van
*Machoke are the movers-not Vigoroth
* Local Wireless Contests with other players
* Zinnia is seen disguised in your version teams outfit (possibly spying on them)
XY Mega Stones
Return.So far the following have been found:
* Alakazamite found
* Mawilte found
* Aggronite found
* Manetricite found
*It is unknown if stones are version exclusive
* Mauville City is huge and looks like a shopping mall-it appears you can bike around it
*Cafes are back (possibly restaurants too)
* Scott has not been seen anywhere yet
* The Ultimate/Pledge Move Tutor is in Mauville City
* Moss Rock is in Petalburg Woods
* You can rebattle NPCs
* Hoopa is tradeable and able to battle online
*Lati Mega Stones and Soul Dew are now tradeable online
*O-Powers are back
* You get the Lati unique to your version after the 5th Gym when Steven Stone gives it to you/takes you to it.The other is obtained via the Eon Ticket
* Starter Mega Stone given to you at Cave Of Origins
According to the IGN review:
* Wondertrade is back
* The Lati Twins can be called upon at anytime to "Soar"-meaning once you get them,there is no need for a party Pokémon with Fly.You don't even need the Lati in your party to use this
From Other "Leakers" who have reviewed the games:
*Battle Mansion returns with a second Daycare Centre
* No Battle Frontier, but NPCs dialogue suggestsit is being built/is coming (possible day one DLC?)
* No Hidden Megas (or any that have been found yet anyway)-this came from Serebii himself-all Megas have already been announced
http://www.neogaf.com/forum/showpost.php?p=139379635&postcount=44 *No one has found the other Move Tutors yet