I predict for online stuff, GF will implement a basic Global Terminal with all trade and battle features of G7 plus a new one or two. Many people hate Festival Plaza and it's gimmick will have worn off by 2018. GF will also want something that can be easily copied to Sinnoh. With single screen, you will never see PSS again...
>>32968663
New dating system that lets your player character build relationships with other characters of the opposite gender. As you increase your bond rank, you get access to more items and features.
Festival Plaza returns with "changes to address the many complaints people had with it" that only make it even worse, Underground is just a reskinned Festival Plaza
motion control Amie/Refresh with HD rumble tactile feedback
>>32968677
There will of course be a mini-game like Poke Finder and Contests. But I think the mini-game in the first core pair on Switch will not be related to Contests. Because GF will want to save that gimmick for DP remakes. Same for Secret Bases.
>>32968663
A version of syncro that works with all Pokémon. Its basically a more balanced mega evolution.