Basically more Nightmare Zone rewards, Armadyl Crossbow (again), overpowered potions, and cosmetics
I simply think they're pointless to add. There's talk of lockdown servers coming that would be vanilla 07 with bug fixes only (meaning you can't use new items in it such as godwars or "rares"), I honestly hope they consider this.
The only problem that may come with vanilla servers is that it may split up the community, but imo that doesn't sound like too bad of an idea.
As far as the potions go, no way. Energy topped off for 30 sec.? Extra prayer points? I'm not down for that.