You should be able to get a free upgrade from 7, 8, or 8.1 any time within the first year after 10 is released.
Will it be worth it is the question.
I have a touch screen computer just purchased with 8.1 that I guess has to be updated with 10 pro, can’t wait to see if that is available or an issue.
So far the 8.1 browser is a loser and I had to download Google Chrome and Firefox.
The rest is little issue.