The final version of AvaStar 1.1 is to be released in 48 hours± per Gaia Clary commenting in Blender-AvaStar group (9/28 1PM SLT). That would be Tuesday 9/30… or Wednesday 10/1 depending on where on Earth she and you are located.
The RC 10 is apparently going to get promoted to a main release. So, if you are using RC10 now, you have AvaStar 1.1.
You can download RC10 now via your download page at Machinimatrix.
There is also the possibility to win L$5,000 for being the first to report a reproducible AvaStar bug in RC10. Apparently as I write this there are no bugs reported for RC10.