Desperately hoping for this sometime in the future. Reach had an amazing story, and I continue to play it even now, despite the fact that it's somewhat outdated by MCC. Really hope 343 does this for us. I don't care how long until this happens, I just want to know that it will happen.
Remember Reach.
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That game was the best Halo, I think. Still fun to play. I'm hoping they add it to MCC at some point, similar to ODST.