Tabata already mentioned they're trying to convert FFXV to Unreal Engine 4, just to try and get a Switch version available.
KH3 is already on Unreal Engine 4, and they could probably downscale it for Switch without too much trouble.
"-(When consider games for Switch), we won't rule out any IPs. Those include new ones, currently active ones, currently not-active ones."
I'm aware that both are possible for Switch, I'm just stating the mid-range games are more likely for Switch, because that's what Square said in the call
It's fair to say FFXV is all but confirmed for Switch, even if it ends up a majorly gimped version.
As for KH3, it'd seem like madness for them not to put it on Switch, seeing as they're even making an Xbone version.
I also like the chances of a Kingdom Hearts collection finding it's way to Switch, but I'm not gonna hold my breath.
By them working aggressively on middle-range games, I don't think it means they'll prioritise less on big games, that would logically have a good market on Switch.
It's more likely to be other big games like Deus Ex or Hitman, which they may not think is worth putting on Switch for now (I'd personally love both these games on Switch).