That environment looks SUSPICIOUSLY like A30...
Plus the Halo ring... Hmm...
Here's my guess:
Noble team goes into space (as seen in E3).
Lands on Covie carrier, commanded by the future Arbiter.
Infiltrates the carrier (possibly Truth and Reconciliation? Remember, there was ammo and healthpacks aboard when the MC went in, so there had to be marines which went in there before the MC did).
Carrier follows the PoA to Halo. Noble team lands on Halo's surface in the same general area as A30, surrounded by Covies.
Noble team somehow gets the intel as to where the T&R is, or manages to spy Captain Keyes being taken prisoner. They report this to Cortana, who sets up a team to take back the carrier.
????
Profit.
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