Yeap, you have a whole year to use it for free and decide if you are going to pay for the update to this beautiful version of Windows OS. The RC is the closest thing to the RTM Version, from now one we wont see any new features added but bug fixed. The RC can be downloaded in 5 different languages from here

Welcome to Windows 7 Release Candidate (RC) testing. We’re on our way to Windows 7, and if you like trying out pre-release software, now’s your chance. You get to see what’s coming, and we get to see if our changes and fixes from the Beta testing are working correctly.