Charging speeds probably weren't one of the main goals of the BMS update. Preventing fires has got to be the #1 objective. That being said, there are a couple of things we do know about the update. It fixes an issue where battery cooling wasn't working, and where batteries could warm up to 50C or 120F or higher. It imposes new validation at startup and throws faults if any of the cell groups deviate by more than 0.1V from the others. It evidently does a better job of keeping the 12V battery topped up - I haven't followed that thread as closely, so I don't know how good a job this is doing now. Beyond this, we don't really know a lot about what the update does.