I'm bored. Here's a lost of MCU characters and why I'm excited at the prospect of a roster being primarily made up of these characters.
Abomination, Absorbing Man, Angar the Screamer, Ant-Man, Arnim Zola, Asgard Ian (other), Baron Mordo, Baron von Strucker, Baron Zemo, Batroc the Leaper, Black Panther, Black Widow, Blackout, Blizzard, Captain America, Captain Marvel, Cloak & Dagger*, Colleen Wing*, Coldblood (technically Savin from Iron Man 3 ) , Cosmo, Cottonmouth, Crossbones, Daredevil, Deathlok, Diamondback, Dormammu, Dr. Strange, Drax the Destroyer, Dum Dum Dugan, Elektra, Executioner* Falcon, Gamora, Ghost Rider, Groot, Hawkeye, Hela*, Hellcat, Hellfire, Hive, Howard the Duck, Hulk, Inhumans*, Iron Fist, Iron Man, Iron Monger, Jessica Jones, Justin Hammer, Kaecilius, Killmonger*, Kilgrave, Kingpin, Klaw, Kurse, Lash, Laufey King of Ice Giants, Loki, Lorelei, Luke Cage, Madame Masque (technically from Agent Carter S2) Malekith, Man-Ape*, Mandarin, Mantis, Maria Hill, Misty Knight, Mockingbird, Nebula, Nick Fury, Owl, Peggy Carter, Phil Coulson, Punisher, Quake, Quicksilver**, Raina**, Red Skull, Rocket Raccoon, Ronan the Accuser, Scarlet Witch**, Sharon Carter, Sif, Spider-Man, Star-Lord, Stick, Surtur the Fire Demon* Thanos, Thor, Ultron, Valkyrie*, Vision, Vulture, War Machine, Warriors Three, Whiplash, Winter Soldier, Yellowjacket, Yo-Yo.
*Upcoming Characters/Easter egg
**Neoxon Trigger
Relatively thorough list, I may be missing a few but I got lazy.
80% of that list includes my most wanted characters. With the Marvel side focused on the MCU, I'm gonna be one happy guy. It's also why I previously mentione that I'm super excited about the Capcom side--I feel like the Marvel side is mostly a lock for me, leaving room for 3 or 4 surprises.