If you were to graph my Challonge development effort, it would closely resemble a sine wave. My wife and sleep schedule enjoy the troughs.
You may have already noticed, but match attachments arrived in Challonge bracket. Matches are limited to a max of three 250KB files for the time being, but you can add links to the big stuff. These attachments are perfect for game replays (.SC2replay files were the feature request), screenshots (great moments or victory proof), and links to videos or live feeds. Also, while the UI change was minimal, I spent a good amount of time figuring out where to put the attachment links. The update added some real estate for additional match-related features (voting being the biggie).
The hype: match voting, multi-stage tournaments, ladders, API