Windows 10 was released last week.
Have you made the upgrade?Reviews of Windows 10 (from TechRader) http://www.techradar.com/us/reviews/pc-mac/software/operating-systems/windows-10-1267364/review
You can upgrade anytime within a year to receive Windows 10 for free (when upgrading from Windows 7 or 8.1)
New laptops will automatically come with Windows 10 starting this week, granted that there are still plenty on the shelves that will have Windows 8.1.
Remember, once you upgrade, you can't go back unless you reinstall a previous version of Windows... meaning you will lose anything not backed up elsewhere from your computer.