If you haven't installed the pre-view version, it might be a good idea to wait until the other comes out. It's only a little over a couple of weeks. If you install the pre-view version now, you won't be able to install the final release over it. And you won't be able to uninstall it. You would have to put your system in a state where it was before you installed the pre-view of 8.1. I could be wrong on this so it would be best to wait to hear from one of the other members who is more knowledgeable than I am.I've already downloaded the preview version. Just haven't installed it yet. Guess I'll have to try it to see if it's worth pursuing.
Download Windows 8.1 Preview ISO files - Microsoft Windows