I'm glad to hear Windows 10 will be free to download for Windows 7/8 users when it's released later this year. Supposedly, it will be free for at least the first year to download then you have to buy it. I'm still using Windows 7 currently. I've only had a brief experience with using Windows 8 and it's OK. Don't hate it or love it.
Although I don't think the whole tablet interface was as bad as people made it out to be.
That makes me happy, although I would prefer it be free permanently rather than just for the first year. I don't understand why Windows can't be like Apple and just make all software upgrades free.
I have Windows 8 right now and don't like it. Too buggy and in some cases, too confusing. And I'll admit, I bought a touch-screen computer because I know Windows 8 was designed for the tablet/touchscreen interface and now realize that I rarely, if ever, use the touch-screen at all. I know I recall plenty of people saying when Windows 8 first came out that it would be a nightmare using it without a touch-screen, but I have found that statement to be completely false.
From what I read, once you download it for free, it's yours permanently. You don't have to buy it. (CD or subscription) As long as you download it for free within that 1 year timeline. Apparently, most PC users today are still using Windows 7 and didn't bother upgrading to 8. It's a major incentive to entice Windows 7 users to jump right ahead to 10.
I believe you can download a Windows 10 preview right now, but they recommend you download it on a test PC and not your personal PC because of risks of crashes/losing your data since it's only a test version.
EDIT: You can also automatically have your Windows 7/8 PC upgrade to 10 via Windows Update once it's released.
EDIT #2: The articles I read were from late January which I didn't pay attention to at the time, but the second one is from yesterday and it says all Windows 7/8 users except Windows 7/8 Enterprise will get the free upgrade offer.
https://bgr.com/2015/01/21/awesome-news-windows-10-will-be-completely-free-for-windows-8-and-windows-7-users/https://www.yahoo.com/tech/s/windows-10-won-t-free-might-hoped-163531271.html