I may be a little behind, I just discovered this update and just wanted to make sure everyone knows about it. The biggest improvement for me was adding white balance kelvin temperature settings. I've been wanting that since owning the 90.

In case anyone else missed this here's the link.

https://eww.pass.panasonic.co.jp/pro-av/support/content/download/EN/ep2main/soft/upgac90_e.htm