The changelog is listed in the Nokia Store as:
- Six fantastic episodes with 180 exciting levels, plus 12 bonus levels!
- Completely new achievements!
- Special Hidden fruits - discover them all!
- Put your Angry Birds skills to the ultimate test in spectacular boss fights!
Download link: AngryBirds Rio v1.4.4. If you already have the game installed then you need to tap on the globe icon on the main menu, shown below - this will take you to Rovio's servers to download the update directly.
Well done to Rovio for continuing to breathe life into their franchise here, and 'Rio' is certainly the most colourful version on offer...!