The kalos starters are the starters for Legends Z-A (Yes they will be receiving Mega's) Game takes place in the future after 15 years from the previous game

New mega evolutions and regional evolutions/Variants

-mega's
Haxorus (Dragon/Ice)
Dragalge
Mienshao (Fighting/Rock)

- Regional/Variants
Most of these Pokémon gained these abilities to help traverse the 5 biomes in lumoise city

For the water Biome
A variant that's similar to Lapras but more resembles an Apex predator that looks like Dunkleosteus Type :(Dark/Water)

For the rocky mountain Biome
A variant of Pangoro That more resembles an ancient sloth Type: (Ground/Rock)

For the snow Biome
A Regional variant of Ferow That adapted to the colder climate due to migrations from kanto it more resembles a Honey buzzard Type :(Flying/Ice)

For the Grass Biome
A Regional Variant of Mudsdale That adapted to the grasslands It more resembles to the French horse "Percheron" Type : (Normal)

For the savannah Biome
A brand new Pokémon that looks like an Armadillo mix between a bear

Xerneas and Yveltal will get new forms but will not be mega's will work similar to Zygrade's 100% form that's linked to a move