Maybe a relaunch with bug fixes, Halo 3: Remastered/Anniversary added to it (to match the Halo 3 Anniversary), and Halo: Reach added. Everything but Halo 3: Anniversary is now free to download and has enhanced Scorpio benefits?
We'll see! It would make sense if Halo 3: Anniversary exists to just be added to the Halo MCC, but that only makes sense if Halo MCC is fixed. At least it's hopeful that they are asking about feedback regarding it. If they planned nothing, then that survey wouldn't exist.
Hm... Seems like updating MCC for Scorpio and hopefully addressing issues would be a great way to save face for 343. I know there's a ton of hate with MCC (I loved it, but I didn't touch the multiplayer) so I think a free update would go a long way there.
Edit: Having only fired up MCC to blaze through the campaign missions I had no idea about how many issues there were. Looked it up and found quite the laundry list of needed fixes. Please do this 343! I now see why people were/are so annoyed.
So I think the reason most of us never received this survey is because we had to re-register to the Halo Community Feedback Program. It would explain why they mention the HCFP in the latest community update. I just registered again and received a confirmation email so obviously something went wrong or was mis-communicated as I was a member of the HCFP for almost two years now.