Q: 5k iMac and Boot Camp Assistant

What is the version of the drivers in bootcamp.xml?

Boot Camp: System requirements for Microsoft Windows operating systems - Apple Support shows that the ability to directly download drivers is being deprecated. You should have version 5.1.5766.

Please also see

Retina 5K - AMD Boot Camp Driver failure

Boot Camp on iMac Retina 5K?

AMD bootcamp drivers is here. (took me a while to find it!!!) strange AMD also does not say on their website, instead referring you to Apple, sadly this new driver does not include support for 5K.

http://support.amd.com/en-us/download/desktop/bootcamp

As for the BCA, I to not know what version it is, I do not even know where the bootcamp files are, when they are being downloaded before the installation. As I am having issues with the USB drivers for my external drives, I hope there are more drivers are forthcoming (USB etc are using all Microsoft drivers).

I did see these drivers. Good to see AMD responding to customer requests/complaints. 5K support should be expected in a future update.

How to complain to AMD? I hope they can get their act together when I upgrade to Windows 10 for free. They haven't updated the drivers since December. While pretty much all the games that I played are working, but I would still like to see support for 5K.

Yes, AMD should, otherwise it is a shame. You can try and create a support request with AMD directly and ask them for their plans and intentions to address this. You also specify your specific card (R290 or R295).