My May 2014 S60 (no AP) got 2019.8.6.3 on April 27th, the first update since 2018.50.6 on February 2nd. Release notes were blank, so I don't know what it was supposed to do, beyond some comments upthread. Haven't looked at climate control but assume that I have dog mode now, although I don't know what it does.
I have a 3000 mile road trip planned for next week so I guess I'll see if anything has changed wrt Supercharging — mine has always been very slow, being a 60 — I'm down to 48 kW at 20%, for example — hope they don't make it any slower! [15% battery degradation (176 RM at 100%), if that makes any difference.]
Nav and maps continue to work very well; I presume that is because my replacement MCU1 is LTE. My browser hasn't worked at all for months (anything to do with being out of warranty?).