July 29 2015 is the big day for Win 10 free upgrade for all users of Windows 7, 8 and 8.1.
Anyone will be able to upgrade within the year of this promotion launch.
What does this mean?
You get a free upgrade to the net new Operating System, however be aware there may be compatibility issues and bugs that may hinder your new OS performance. It's a trade off you must carefully balance to see if it's to your benefit.