It seems by the phrase "some of them we will own, some of them we won't" that Bungie may be in on new Halo as well, and possibly the rumors of Gearbox making Halo 4 have some fesability. For now all we can do is wait and see.
The news, very reliable news, comes weeks after we broke the news that Gearbox Director of Technology Corrinne Yu had been hired by Microsoft Game Studios to be Principle Engine Architect for Microsoft's Halo Franchise Team"
Interesting stuff on the Halo front today. Let's see how it all pans out.