Perks: Double Tap 2 and Electric Cherry I'd say are guaranteed. I am unsure about Vulture Aid. The map and its weapons it features in make it way to OP. I think it could do well but only on certain maps. Five or Verruckt for example I don't think it would overpower it to much, but that's only because the Winter's Howl is the weakest WW, where ammo regeneration would help it but not overpower it like it would for any OHKO WW or the Scavenger.
Tombstone could appear but I doubt it. It's only appearance was on the worst map possible for it. It needs a smaller map like the BO or WaW maps. Who's Who I'd say has a better chance but it needs to be in the right map. Not to mention these two are kinda similar to Quick Revive (all 3 deal with downs and revives), but, QR cant net you more than 4 perks.
I'm unsure with Wunderfizz, but think it could be the next big staple in Zombies after Buildables. We have a random weapon box, why not a random perk thing?
I do think it will get a makeover though. The way it looks fits the Origins style like the Mystery Box and PaP in that map. Maybe it will be a cabinet on normal maps?
Persistant Upgrades: I never actively went for them and I wouldn't miss them if they left. I think it needs tweaking if it wants to work.
Modes: Grief will definetly stay. Turned probably not. It will need a lot of work to come back.
The whole naming thing annoyed me though. TranZit, Die Rise, etc are just modes. So are the map names on WaW and BO1 mode names or maps names? Confusing as hell, they're all just Survival so there's no need for unique mode names. Nuketown didn't have it and it worked fine.
Buildables: I do think they're a staple now in Zombies but I think they need to really think of what buildables need to be there. The Turbine and its uses were just not fun. I think the Shield and Trample Steam will return, as well as weapon upgrades like the Acid Gat Kit. Those could be something special.
Weapons: I'd like the SVU or AN-94 to be a staple in the box for the next game, like the Galil and others. EMP's I wouldn't mind either. Wonder Weapon wise, probably the Hell's Retriever. Sliquifier and Blundergat maybe, and I'd only want the Paralyzer just for flying haha.
Galvaknuckles will be a staple. I would like to see more variety of melee weapons though. Really disappointed they didn't include that sword from the BO2 campaign, hopefully they will though.
Ranking: I kinda want one but overall no. Even if it completely changed, there is bias and elitism in the community. Oh you aren't a Shotgun? Sorry you can't play with us. Granted this was in BO1 as well, based of others high rounds, but it was not as bad back than.
I like stats Leaderboards though. I did find some of them pointless though.