Some information and speculation seems to be brewing and the source of the location is http://forums.oxm.co.uk where apparently they're saying that the next issue of the "Official Xbox Magazine" will feature, "A World Exclusive: A Killer Sequel - Must-read Details on Truly Spectacular Reboot". Other information that now seems to be deleted(?) and/or may have leaked is something that was apparently written on a blog via "OXM", "The announcement of a killer sequel, the first must-see details on the return of a franchise really spectacular".
There are several sites that have some information all circling around the same thing really:
Does this mean the "classic" Killer Instinct is coming to XBL finally or could it mean a new game?
Thanks to @EL FUERTE BRAZI for this tip!