RHEL6 was just released at 2010-11-10 20:09:50 CET. Quoting Red Hat press relase: Today, we delivered Red Hat Enterprise Linux 6 to the market. @Red Hat: you are so mean! Next time inform your fellows one day in advance to give your fellows the chance to fill the fridges with champagne!
I did not checked (yet) the differences between beta 2.1 and GA. I guess the differences are at a minimum.
The odd thing is: It seems not be available via satellite-sync yet (yes, sat540 is in place).
[update]You need to get a new certificate from Red Hat support to get access to the rhel6 channels, regardless if you got one a few days ago to install sat540.[/update]
Having fun? No, I do not have any champagne in my fridge 😉