Nico Nico Douga has gone through one of those new updates again. This usually means an interface change, but from what I see, things seem to be way different from usual. Other than the more noticable change in interface, nearly everything seems to be in English now (for foreigners, I think).
A notable feature I find is the
translate feature which appears as a "Translate" button next to the video title of a video page. People who know Japanese volunteering to translate the
current trends (translated videos have a green border and shaded box) would surely be great news for other people who wish to view and get to know such trends. On top of that, your username appears somewhere at the bottom of the page as translator.
EDIT: Forgot to state this, might not be that important, but the comments databse of a video is now divided into English, Japanese and Chinese comments, and can be changed by clicking the flag at the bottom right corner of the video interface.