Yeah, sorry about that. It was indeed done in a hurry.
I think the main highlights are:
- The API/ABI break (implied by the major bump)
- The many improvements in the native AAC encoder making it the recommended one (libaacplus and libvo-aacenc are removed)
- A ton of filters were added
- Many ASM optimizations that weren't mentioned in the Changelog (it will take a while to make highlights on those, I don't remember them)
Hopefully a proper news will be posted soon. Sorry again.