So, what will it be?
Personally, I choose option 3.
EDIT: This thread was posted PRIOR to E3. It is CONFIRMED that there's a Halo Master Chief collection with a remastered Halo 2, which uses a remastered MP. The game DOES look to run on Halo 4's graphical engine though, but it's NOTHING like Halo: CE's Halo: Reach MP was.
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None of those. I'd just laugh at how hard 343 shat the bed if they actually did plan on bringing Halo 2 back and this is how they did it.