A trailer will be released... That is all
Also the starters secondary evolutions will be shown, both Day and Night forms along with more applications for Z-Power including Z-Forms. Also yes the Day/Night forms of the starters are exclusive, but post game you get the opposite legend (you get some prevo form thing) which changes their forms to time based instead of version based. Also in the future Kyurem will get a Z-Form, summoning Zekrom/Reshirahm and fusing to become the ultimate dragon. And Ultra Beasts aren't catchable but you'll be able to summon them with a special Z-Crystal