If any 3rd party could crack 1m who cares =P
My guess will be ZombiU, nothing else has even come close. Everyone talking up Sonic Boom here is confusing me too, everyone has been hating on that game and that should mean good sales?? And yet the one with all the pre-launch hype and even got 2 Nintendo themed DLCs barely broke 200k
edit: new guess just because why not, Sonic the Hedgehog... just not Lost World or Boom =P