League of Legends Audio Upgrade Plans

The League of Legends Website announces that the next few patches for League of Legends will be larger than usual. Word is: "New software built by our tools team requires champions to be updated in your game install, and an audio engine update requires a re-patch of audio data. These updates will allow us to create even better in-game content and audio moving forward." The post has more details on plans for Riot's MOBA, including an outline of the changes coming to the audio engine:
Audio team upgrading the audio engine:
Riot Eno here from the Audio team! For several years now, LoL has been using a third-party audio engine. One of our challenges right now is keeping the audio engine robust, sustainable, and supported—even Audio can have trouble finding a good support now and then. To ensure this, we need to update our audio engine, which requires a full re-patch of audio data. The upgraded engine will give us opportunities to improve the audio mix for League in the future, and allow us to continue delivering great sound. When we re-patch all the audio banks in 8.5 you’ll see a patch ranging from around 1.8-2.2 GB total. This number will vary depending on your location since some regions have larger VO size than others.