Hot doesn't make much sense for comments because it was designed for threads. There are very *very* few people who use it in comments, and we suspect most of those are on accident - we don't provide good descriptions of what the sorts are, so it's not obvious which of 'hot', 'best', and 'top' you should choose when looking at a comment thread (particularly when 'hot' is the default for submission listings).
Contest mode originally forced the sort to `top` for mods to assist in choosing winners. However, /u/timotab [pointed out] that the ability to use `new` as well would be useful for moderation. Now mods are able to use whichever sort method they wish when browsing a thread in contest mode. : https://www.reddit.com/r/modnews/comments/2z913o/moderators_new_features_for_testing_before/cpgyzm7
Previously, localized_appendices would be ignored in nested LocalizedModules because the Module.build() step would just call get_source() on the nested module. This caused the plural forms expression to not be properly appended to the reddit-init and reddit-init-legacy modules since they nest the reddit-init-base module.
Thanks to a report by Tim McCormack (/u/phyzome). This fixes an issue where someone embedding comments on their site could XSS themselves on *their own* site if the parent post of the comment had HTML in the title.
The comment-hiding behavior of Q&A sort has been confusing when viewing a comment permalink, since it is fairly likely all the comments would be hidden. This is particularly problematic when the user hasn't explicitly set the sort for that page, eg by having it set as their default through the sticky sort behavior or due to a subreddit- or thread-default sort. Now we don't do any hiding of comments due to Q&A sort on permalink pages.