I'll discuss TES VI:
-Settlements
-Perk system with attributes (instead of using SPECIAL, TES could maybe use something like CLASSIC: Charisma, Luck, Awareness, Strength, Swiftness, Intelligence, Continuity)
-Magazines that grant special abilities/techniques, except in TES they could be books, and pehaps grant skill-specific techniques that are more akin to what we saw in Skyrim with some stuff
-Legendary enemies
-More unique weapons
-Creature movements, behavior, and special abilities that provide multi-dimensionality to combat (I am impressed with FO4 in this regard)
-Some new armor/weapon smithing options to provide additional customizaton
What I'm not wanting to see from FO4 in TES VI:
-Voiced protagonist (not unless there's greater enhancement of topics, dialogue fluff, more skill checks, more factional stuff, and variety in the voices able to be chosen, along with a few other things that I posted in a topic about voiced dialogue on the TES series speculation forum)
-The dialogue wheel (not at all, no wheel please)
-Elimination of skills entirely