I believe along side of the changes mentioned for Vouching (which I think is an incredible idea), I'd like to see changes to the way that submission titles are changed. I'm actually very much for changing titles that are clickbait-y or misleading, but I feel like sometimes the original intention of the article is lost when the titles are changed. I think it would help a tremendous amount if a changed headline is noted as changed (for example, with an asterisk like the on on this post) so that users know that they aren't the original submission. I think it would be even more helpful if hovering over that asterisk to show, or including a link to show, the original title would help. That way it's hidden from being easily influenceable on voting but still allows the initial context of the submission to be present
Otherwise, I think both of these announcements are great news and would like to offer congratulations to Y Combinator, Dan and the whole community for keeping this such a useful site and community through all these years, even despite growth and changes to members.