It seems like our local SI representatives recognize the need for an up to date summary document to point people to.

Maybe this is what you're implying is already in progress, but if the main issue is that parts of the sequence are out of date, maybe Eliezer could commission a set of people who've been following the discussion all along to write review pieces, drawing on all the best comments, that describe how they would "rediscover" the conclusions of the aspect of the sequence they are responsible for themselves (with links back to original discussion).

Ideally these reviewers would work out between themselves how to make a clean and succinct narrative without lots of repetition; e.g. how to collapse issues that get revisited later or that crosscut into a clear narrative.

Then Eliezer and the rest of us could comment on those summaries, as a peer review.

Of course, it's fine if he wants to write the new material himself, but frankly I want to know what's going to happen in HPMOR. :)