Speaking at a Microsoft press event last week, Ensemble designer Graeme Devine stated definitely that there won’t be a Halo Wars for Windows despite rampant speculation that the Halo-themed RTS would end up on PC.
While he does state it, Devine also noted that the final decision rests on Microsoft: "Zero. Never. I’m going to go on the record and say never ever! Microsoft may go and announce it, but I’ll say never."
As for Ensemble’s successor, Devine commented that an announcement is coming soon and that a “new studio [is] forming that will rise from Ensemble.”
Microsoft Game Studios and Ensemble are going to release Age of Empires III: Gold Edition on September 25 in North America. It will retail for $40 and will include the full game and The Warchiefs expansion.