MicroSoft is scheduled to release their latest upgrade to Windows 7.x and 8.x on July 29, 2015. It will be called Windows 10 and is a free upgrade. MicroSoft is currently updating your computer with a "reservation option" as noted below.
At the college, we will not be going to Windows 10 for some time - we will want to thoroughly test it in many environments and with many applications and also want to wait and let others find all the inevitable bugs. It is likely that we will migrate to Windows 10 sometime next year - and will announce to everyone our plans well in advance.
At home, you will decide if and when you want to do the upgrade. It all starts with a current version Windows update that puts this icon on your computer desktop:
Here are good resources regarding Windows 10: