I'm CIA stationed in South America who intercepted a Nintendo smuggler (yes, I know Bane, but I can't disclose anything about him).
The info recovered regarding the next game is as follows;

>Pokemon AXYZ (pronounced Axis)
>Sequel to XY (whichever you played, they avoid mentioning specifics like whether XY protag caught Xerneas or Yveltal. They just refer to 'the Legendary Pokemon')
>set 3 years after XY
>new Kalos Dex; the Southern Dex
>older Kalos Dexes tweaked a little
>Mega Zygarde gets the ability Inverse Aura, which reverses type effectiveness like in an Inverse battle
>Plot revolves around Lysandre trying to use Zygarde to force nature back into equilibrium. He can't do it cause he's a dick and MC manages to bond with Zygarde and Mega Evolve it to defeat Lysandre
>new gyms and E4
>Gyms: Normal (Jeffery), Ice (Wulfric), Bug (Viola), Dragon (Drasna), Steel (Wikstrom), Electric (Clemont), Dark (Elana), Psychic (Olympia)
>E4: Siebold (Water), Armstrong (Poison), Malva (Fire), Shauna (Flying)
>Champ is Korrina. Her fight removes the limits on Mega Evolution. She uses a team of six Fighting type Megas. You can use as many Megas in that fight as you want as well
>New towns and routes and shit
>No BF but Maison has a random mode where you use random rental Pokemon, so that's alright I guess
>New Megas: Zygarde, Chesnaught, Delphox, Greninja, Talonflame, Meganium, Typhlosion, Feraligatr, Malamar, Goodra, Noivern, Mienshao, Machamp, Kingdra, Roserade, Xatu, Ledian, Porygon-Z, Druddigon, Bisharp, Haxorus, Articuno, Zapdos, Moltres, Lugia, Ho-oh
>PWT returns, no major changes
>Shiny Inkay holding Malamarite event given out over wifi on launch day
>In Postgame, Ramos will give you a choice between a Ferroseed, a Skiddo or a Phantump all at level 5, all shiny and all with Frenzy Plant

I'll be back eventually, I'm gonna torture the smuggler some more to see what I can find out about the new Star Fox.