If we "predict" the dex we get:

Rowlet
Rowlet 2
Rowlet 3
Litten
Litten 2
Litten 3
Popplio
Popplio 2
Popplio 3
Pikipek
Pikipek 2
Pikipek 3
Yungoos
Gumshoos
Grubbin
Charjabug
Vikavolt
Komala
Komala 2
Rockruff
Rockruff 2
Cutiefly
Cutiefly 2
Wishiwashi
Bruxish
Morelull
Morelull 2
Fomantis
Lurantis
Drampa preevo 1
Drampa preevo 2
Drampa
Mudbray
Mudsdale
Togedemaru
Salandit
Salandit 2
Minior
Crabrawler preevo
Crabrawler
Sandyghast
Palossand
Mimikyu
Stufful
Bewear
Turtonator preevo 1
Turtonator preevo 2
Turtonator
Comfey
Bounsweet
Bounsweet 2
Wimpod
Wimpod 2
Oricorio
Pyukumuku
Pyukumuku 2
Tapu koko
Tapu 2
Tapu 3
Tapu 4
Solgaleo
Lunala
Marshadow
Mythical 1
Mythical 2
Mythical 3

~66 pokemon.

Only a few left (10 or so, so probably 4-6 evolution lines) if they go XY road with ~20-25 Alolan forms replacing megas as "new mons" to make 75+25~=100

This gen will probably be very small.

What do you think ?