Do want: Finish Powerset Proliferation. Every armor set proliferated to every melee archetype. Every melee attack set proliferated to every melee archetype. Every blast set proliferated to every ranged archetype.
Do want: Use mostly-existing animations to finish the Experimentation, Force of Will, Gadgetry, and Utility Belt power pools.
Do want: New content. Wrap up the Battalion/Coming Storm plotline. Then write new stories wrapping up dangling plot threads from existing canonical stories, like the war in West Libertalia, the fate of the Soviet supersoldier program, Stheno, Merulina, the underwater lost city, the Council moonbase, Rikti Earth, Council Earth, and Nemesis' hidden city in the Shadow Shard. Ideally, I'd like to see a content release schedule comparable, or at least half as good as, Guild Wars 2's. Let's say three new content releases and one new zone per year.
Do want: Any reason to care about the Freedom Phalanx as people. In new content, have them show up as helper NPCs in the mission with scripted dialogue that lets you see what they're like as people. (Incarnate content would be a good place to do this.) Basically do for them what Melissa Bianco did for the characters she introduced in the New Faultline arc.
Do want: Player housing. Specifically, give each player the option to join two supergroups, so that they can use one as a personal base/lair for themselves and their alts, and one for group content. Continue to expand the decor options.
Do want: More Incarnate content. One new 24- to 36-person raid every year or so, corresponding to the unlocking of each new Incarnate slot.
Do want: Any needed bug fixes or minor balance tweaks to existing powers.
Do want: More mastermind primary powersets based on existing NPC groups. In particular: Paragon Police, Rogue Isles Police, Praetorian Police, and Praetorian Clockwork. A mastermind-primary version of the Illusion Control set would be nice, too. Nothing that requires extensive art or animation time, just more RP flavor options that tie into the existing lore.
Do want: Annual expansions, however small, to the holiday events. (More valentines. Holiday base decor. Seasonal decorations in Atlas Park and Pocket D. A summer-holiday fireworks event using Null the Gull's "luau" zone. New monster types for trick-or-treating. New holiday-themed rewards.)
Do want: Better open-world content. Put some or all zone events on timers, or at least display warnings well in advance, so that it's easier for groups to organize for them. Make the rewards for giant monsters, in particular, valuable enough that people are eager to fight them again. Also, create a Prestige power toggle that auto-exemps you down to the max level for the neighborhood you're in, to incentivize street sweeping.
Do want: Finish the Hazard Zone revamps. Either reduce the Hazard Zone spawn sizes to solo, or get completely rid of the Hazard Zone security-chief missions.
Do want: Additional clarifications of the level 1-15 hero content. From time to time, revamp one of the Level 1-15 hero contacts, replacing their random door missions and street sweeps with actual small story arcs. Further differentiate (and label!) those contacts so that players who are trying to do so can specifically follow the Hellions storyline, versus the Skulls storyline, versus the Council storyline, versus the Clockwork storyline, versus the Vahzilok storyline.
Do not want: More PvP content. PvP can never not suck in a game where most of your attack root you in place but the enemies move at 60 miles per hour.
Do not want: Action combat. I've enjoyed action combat in other MMOs that were built around it from the start, like Wildstar and Defiance. But none of those games had City of Heroes' fantastic combat animations or variety of archetypes and powers, because the animation budget to have in-motion versions of every power moving in all eight directions would break the bank.
Do not want: More phased content open-world. The phased-content system in Atlas Park and Mercy Island is grinding the frame rate down in those zones, especially in Atlas Park. (If you can debug this and it stops being a problem, I withdraw this request.)