Due to Anonymous nature of 4chan I can disclose these leak

Omega Ruby and Alpha Sapphire have many new Mega Evolution

Mega Weezing: Poison/Fire - Levitate
Mega Jynx: Ice/Psychic - Adaptability
Mega Sudowoodo Rock/Fighting - Rock Head
Mega Steelix: Steel/Dragon - Mold Breaker
Mega Skarmory: Steel/Flying - Sturdy
Mega Shiftry: Grass/Dark - Skill Link
Mega Exploud: Normal - Soundproof
Mega Sableye: Dark/Ghost - Strange Gem
Mega Sharpedo: Water/Dark - Strong Jaw
Mega Wailord: Water - Pressure
Mega Camerupt: Fire/Ground - Storm Drain
Mega Flygon: Ground/Dragon - Levitate
Mega Salamence O: Dragon/Flying - Moxie
Mega Salamence A: Dragon/Dark - Intimidate
Mega Metagross: Steel/Psychic - Iron Fist
Primal Kyogre: Water - Aqua Aura
Primal Groudon: Ground/Fire - Magma Aura
Primal Rayquaza: Dragon/Flying - Air Lock
Mega Empoleon: Water/Steel - Defiant
Mega Bronzong:Steel/Psychic - Filter
Mega Toxicroak: Poison/Fighting - Dry Skin
Mega Weavile: Dark/Ice - Technician
Mega Togekiss: Fairy/Flying - Pixilate
Mega Krookodile: Ground/Dark - Moxie
Mega Scrafty: Dark/Fighting - Intimidate
Mega Cofagrigus: Ghost/Steel - Mummy
Mega Diancie: Rock/Fairy - Shining Body

Also secret base is in with streetpass function!

That is all. Good night!