Something that caught me by surprise was the release of libbdplus which happened almost exactly one year ago. This filled a gap in the free software community that had been open since 2007 when the first BD+ discs came out.
The story here is that Bluray discs won the format war against HD-DVD because they don't just encrypt their files with AACS. They include a diabolical piece of self-modifying code called BD+ which gained an early reputation for thwarting decryption efforts. For many years, open source Bluray decryption tools only existed for discs that were BD+ free. Those cracking tougher nuts had to use MakeMKV and AnyDVD which kept the source code hidden thereby making important knowledge vulnerable to censorship.
In 2009, when I first heard about VideoLAN's plan to develop libbdplus, the lack of a git repository was suspicious. Why would a group known for prompt code releases in all of their other projects suddenly decide to develop one behind closed doors? Especially the most anticipated advancement since libdvdcss. Years went by and rumours of an imminent release became less frequent. Not only that, but other BD+ projects ceased development because they saw no need to duplicate effort. By 2013, I was not just accusing the developers of changing their minds, but causing outright damage to free software in the process. The end of December 2013, when they released libbdplus after all, was the time for me to take it all back. But hey, it's Christmas... a time to be pleasantly surprised!