This morning I went to use the timer, and long pressed the light button to get the controls menu, but rather than seeing the menu, I got a message saying the watch had been upgraded to 5.10. I had been running 5.08 beta prior to this. I did not even know 5.10 was available but coming to the forum found the sticky and others reporting they had been upgraded to 5.10.
This is all rather cool, but I wonder how long it would have taken me to notice had I not selected the controls menu. How have others been notified of their upgrade? Does this message appear the first time any button is pressed after after an upgrade? The controls menu worked second time I pressed the button after going into settings and confirming I really was running 5.10.
Anyway, everything looks good so far. I guess this is just the production version of 5.08/5.09.