Done a list of everything the videos showed us from the reveal of XY till the release date. Maybe it'll help us think of SM announcement possibilties
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January 8:
Trainer Designs
First Look of Region
#FranceConfirmed (ala Eiffel Tower)
Starters
Look inside 2 gyms and 1 E4 building
Legendaries
Release Month
February 14:
Sylveon revealed
April 6:
New Mewtwo "forme" (later, to be shown as Mega Mewtwo Y)
April 17:
Footage of Mewtwo from the Genesect movie turning into Mega Mewtwo Y
May 14
Riding on Gogoat
First Look at Shauna
Fletchling
Helioptile
Pancham
Gogoat itself
New moves: Parabolic Charge, Parting Shot (both names not shown though)
June 11:
Region Name
Region Map
Vivillon
Noivern
New Moves: Boomburst, Moonblast, Fairy Wind
Fairy-Type (Sylveon confirmed as Fairy alongside Jigglypuff, Gardevoir and Marill)
Pokemon Amie
Release Date confirmed - October 12
June 11 (Trailer 3):
Sky Battles
Talonflame
Skrelp
Clauncher
Horde Battles
June 12:
PSS
France confirmed
June 14:
Tierno, Trevor, Alexa and Viola shown
Scatterbug
Spewpa
Litleo
Flabebe
New Move: Noble Roar
July 5:
Honedge
July 12:
Sycamore revealed
Inkay
Malamar
Pangoro
Swirlix
Spritzee
Team Flare revealed
New Moves: Topsy-Turvy, Draining Kiss, Geomancy, Oblivion Wing
August 9:
Mega Evolution confirmed
Mega Lucario
Korrina revealed
Shalour City gym shown (3rd gym so far)
Diggersby
Dedenne
Skiddo
New Moves: Nuzzle
Torchic event announced
Mega Blaziken
August 11
Mega Mawile
Mega Absol
Mega Ampharos
New Move: ??? (Mawile is using something but I can't tell what it is)
September 4
Kanto starters revealed
Mega Venusaur
Mega Charizard Y
Mega Blastoise
Pokemon Bank
Poke Transporter
Special Edition 3DSXL System
September 13
Quilladin
Braixen
Frogadier
Tyrunt
Amaura
Meowstic
Furfrou
Pyroar
Mega Garchomp
Mega Mewtwo X
Furfrou Grooming
Character Customization
October 2:
Mega Charizard X
October 11:
Coumarine Gym inside shown
October 12:
XY released worldwide