I also may just not be looking in the right place, but it seems like the only full version of Resolve you can buy right now is 11 - but obviously that can be upgraded for free to 12.
I'm trying to find out from Blackmagic what their plans are with this, and if there will ever be a $500 dongle version that works on Windows, but we'll have to wait and see. Here's the big question that still remains, it seems like the only version available to buy with the dongle that will work for both Windows and Mac is still $1,000. That means customers that purchase DaVinci Resolve 12 Studio from the Mac App Store can run it on multiple personal Macs, like their laptop and desktop computers, simply by using their Apple ID. Now available on the Mac App Store for only USD$499, customers have more flexibility than ever before because the software downloaded from the App Store features built in security and does not require a hardware dongle to run. The difference here is that it's specifically only for OS X, and only available through the Mac App store. Another benefit to the App store is that a dongle is no longer necessary to run the software - you'll simply use an Apple ID attached to the software to run it on different systems:
The full suite is now available for just $500. Blackmagic has done some more price dropping, this time for the full Resolve 12 Studio on the Mac.