Rumors are a good way to see that a particular market is strong. Especially if the rumor mill starts picking up one rumor in particular, and you start hearing it whispered in every which direction. There's a rumor that's been floating around for a little while now, but it has begun picking up steam in the last few days. So much so, in fact, that Microsoft has felt the need to step in and clarify the situation. The rumor, is that 343 Industries and Microsoft have already begun work on their next yearly installment within the Halo franchise: an HD, remade Halo: Combat Evolved.