It's TitanFall. The Mantis is not going to appeal to any player who watched the Titans in battle. A large chunk of the demographic who play Halo for the sci-Fi aspect were just handed a new IP that might be their holy grail that excites them. Better really rethink the Halo strategy or watch one more portion of its community sail for distant shores as they did with Call of Duty.
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343 will loose whatever fanbase it has left just by shitting over Halo themselves. They don't need a new Sci-Fi IP to jump ship from 343 trying to bend them over and love them tenderly.