I thought the same as you Doc. As long as you upgrade in the first year, your good to go. Looks like we are right.
I looked at the link Kevo posted and it says:
"If you have reserved, we’ll notify you when your upgrade is ready. You have until July 29, 2016 to take advantage of this free upgrade offer. Once you upgrade, you’ll have Windows 10 for free on that device."
I have my music PC off-line. My plan was to upgrade that machine when the smoke cleared. I am trying to find out if I can do it off-line.