Darkstalkers was being rumored as the next revival, but with how much fuckery has gone on from Capcom lately, that might be terrible.
Killer Instinct was made by Rare, which is owned by Microsoft now so it would be a console exclusive if that ever got made. The main founders left Rare around the start of this console generation so even then, that too would probably suck. I'm not sure if they even owned the rights to it, or if Midway did. Maybe someone will buy the rights from Midway if they own it, seeing as they filed for bankruptcy.