The beta 11 (that finally can run OS4.1 for example) has been released: http://eab.abime.net/showpost.php?p=970118&postcount=457
Remember this is Beta and it's "Just working" for the fist time.
Are you sure about your statement above?
I read through the thread on EAB and all I could see is that one or two people got the AmigaOS4.x flash screen to show up for a few seconds, before the emulation crashed, froze up, or went black screen. I have not read that anyone has gotten AmigaOS4.0, or 4.1 for Classic running on WinUAE yet, but maybe I need to read the thread again, or maybe someone just posted some new information today that I have not seen yet.
If you are not running AmigaOS4.x on WinUAE yourself, please be careful not to spread false rumors. I would hate to see several people go out and buy AmigaOS4.1 for Classic thinking that they are going to be able to run it on WinUAE, only to find out that it is not running yet, or worse that it might never be able to run completely bug free on WinUAE. Not trying to dispute what you wrote, just saying that when I read that thread, I did not see any definite claims that AmigaOS4.x is now running completely on WinUAE.
I suggest caution and patience, until we have several confirmed reports from different people who have been successful in running AmigaOS4.1 for Classic on WinUAE.
Edit: Well, I guess that thread is moving too fast for me. Maybe some people are running AmigaOS4.x on WinUAE. Too much info for me to keep up with, since I am not really interested in running AmigaOS4.x on WinUAE at this time. Maybe in a year or two that will change, but for now, I think I will stick to using my X1000 for running AmigaOS4.x. Forgive me for doubting your statement about anyone successfully running AmigaOS4.x on WinUAE. I still don't know how successful or how fast it is under emulation, but I imagine that if/when it becomes as fast, or faster than running in on a SAM system, then we will see more people using WinUAE to run AmigaOS4.x.