For starters, having to discard an energy from hand could work with decks like Ceruledge ex that benefit from having energy in the discard
Kelp takes the place of forests, there's a new sea-based evasion mechanic that's equivalent to flying, and all the humans are stuck in diving suits and submarines
Paldean Fates is a set dedicated to giving as many Pokemon as possible the shiny treatment, letting the alternate color palette shine
Given that The Pokemon Company has already based one TCG expansion on a mobile game with Pokemon GO, it's not too far-fetched to assume a Genetic Apex physical set will be released at some point down the line
The Art Revolution This is the single most important trend in modern collecting
Im talking about Talrand, Sky Summoner, Baral, Chief of Compliance, and Archmage Emeritus specifically