It seems that Microsoft is known bad on how it treats it's partners and this situation isn't really different.

Back in 2005 Fusio announced a new Halo title that will arrive on mobile applications. Once Microsoft saw the deal it was instantly terminated. The reason it was terminated was because Fusio has still yet to make their second payment of 500,000$. Fusio retaliated by saying that the reason they did not pay the second payment is because Microsoft has still yet to live up to it's own obligations. Discouraging Fusio on making their second payment, what were these obligations? They were really simple. The company had created numerous Halo designs and game concepts but Microsoft refused every single one or ignored them without explaining the reasons. So imagine how Bungie put up with the 7 years at Microsoft? Microsoft bought Bungie back in they year 2000, so Bungie was pretty patient I guess.