Gearbox have stated today that the rumor that they will be developing Halo 4 for the next Xbox is just that, a rumor.
“Weâ€™ve been hearing from a lot of people regarding that rumor, as you can probably guess! We havenâ€™t made any official announcements regarding any work with the Halo franchise â€“ if we havenâ€™t put out a press release announcing a title, it is just a rumor.”
Then again, this is a very expected response. For those fans who would like a glimmer of hope, it is not like he directly denied it.