Windows 8 is RTM. It was released to MSDN subscribers and OEM on 8/15/2012. It's also going to be available to general public in about 2 or 3 weeks for a ridiculously low upgrade price of $20 or if you're feeling like splurging for Ultimate - $40.
Consider this 'practice' for when everyone upgrades from Windows 7 to Windows 8. It will happen.
This is a tad ridiculous.
Win8 is RTM, it's not GA.
There's no reason that BioWare should be supporting a pre-GA OS.
The 1.4 changes that hosed graphics for a lot of people are also ridiculous, but let's keep our daggers pointed where it's deserved.
If 6 months go by after GA and Win8 is still not a supported platform, then we've got real issues.