Killer Instinct is still trucking along, and more fighters are on the way, starting with Spinal, who is launching today on the Xbox One. If you have the Season Pass, he's included as a free download, otherwise he can be bought piecemeal. Spinal has a decidedly pirate-esque theme to him, and he'll be able to teleport, as well as launch projectiles.
He seems like a fairly interesting character, so I'm booting up Killer Instinct as we speak to test him out! As a side note, Fulgore is still coming in March.