Win 10 product key

Does anyone know if the Win 8 key is the one you will use with the iso dvd for Win 10 or will a new one be used?

You must first do an upgrade from 8.1 to 10. The 8.1 embedded key will be used to validate that 8.1 is indeed a legal install and therefore upgradeable.

Once you have done that you can wait for the ISOs to be made available or use the ESDtoISO tool to create your own ISO that you can use to clean install with.

Understood and thank you. It appears you will not need a key to do a future reinstallation.

Supposedly not. Time will tell.

http://www.tenforums.com/tutorials/6607-reserve-free-upgrade-get-windows-10-windows-7-8-1-a.html

This is information you most likely are aware of or have read but if not I hope it helps.

Yes, thanks, I've seen it.

If you ever need to see all your software keys, includes Windows, Office, etc. run belarc (advisorinstaller.exe) from http://www.belarc.com/free_download.html

Yes, I have had Belarc advisor and at this point in time have Speccy which suffices and provides temps.