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I have thought about this from time to time. Here are some things that would make Z a great followup to XY. Granted, most of these would be wishful thinking.
>Expanded regional pokedex, probably incorporating pokemon exclusive to the friend safari
>More mega evolutions; probably about 20 or so
>A few new locations and routes added to Kalos
>Rival/friends all have more fleshed out teams and more chances to fight; Tierno and Trevor now incorporate the Kanto starters you don't pick from Prof Sycamore
>Gym leaders, Team Flare scientists, and Elite Four each have an additional pokemon in their initial encounters; Elite Four have one pokemon that can mega-evolve
>Diantha's ace is now Mega Diancie
>Zygarde factors heavily into Team Flare's plans somehow; Lysandre uses each form of Zygarde in your battles against him (10% in first battle, 50% in second battle, Complete in final battle)
>Move tutors can be found in towns across Kalos similar to Platinum and B2W2 tutors
>New egg moves
>Full team gym leader rematches for both Kalos and Hoenn gym leaders at the Battle Chateau, as well as battles with ORAS supporting cast like Wally, Zinnia, Steven, etc.
>Elite Four rematches with new and improved teams
>All mythical pokemon are catchable post-game, similar to how all legendary pokemon were available in ORAS