Some might know about the whole Mendicant Bias thing, with Master Chief being on the ark. I have a new theory. First you need to see this:
“…Subsequently, Mendicant was sentenced and locked away on the Ark installation. This would not be permanent however, as sometime after the activation of Halo, a shard of the AI managed to escape into a Forerunner dreadnought, attempting to make amends for the crimes against its makers by aiding humanity. The ancilla’s efforts were cut short when the dreadnought crashed onto Janjur Qom, the nascent home-world of the San’Shyuum.”
Here’s information stating a part of MB is on the Prophets’ home-world. It’s part of the description of MB on Halo Way point. Now, anyone remember this: http://oyster.ignimgs.com/wordpress/stg.ign.com/2014/05/halo-5-guardians-concept-dffa4072fcb44c61aea563cd9e473f72.jpg
Now, to me this planet looks to be dessert looking, and where was Master Chief in the teaser? In a dessert. Notice the Elite statue in the back-round? Could this be Janjur Qom? If so, there’s no doubt that the Forerunner Machine is the fragment of MB. So Master Chief is likely on the Prophets’ home-world. In the first cut-scene of Halo 2 Anniversary, Arby is looking at a hologram of the Forerunner Machine, this could mean Arby knows Master Chief is looking for the forerunner machine. I could make a thousand theories from this, but the information isn’t specific enough. I want to hear everybody’s opinion of this.