We received our car Sunday the 14th. Yesterday afternoon I noticed a software update on the touchscreen. I installed it during the night. The Tesla screen shows the 50.11, and the appendix seems to be the same.
No release notes appeared on our screen that I could tell. I don't know if this update concerns only autopilot (we did not order it) or has more general changes.
Sorry, cannot help, but we did receive an update yesterday.