You might still be able to download the free preview version from here http://www.microsoft.com/office/preview/en
It should work for 60 days after 2013 came out. It should give you a good idea if you like it or not.
The biggest changes in 2013 are SkyDrive integration. If you don't really need SkyDrive you can probably live without it until the next version of Office.
I do find 2013 uses less memory than 2010 and generally performs better which is the reason I have stuck with 2013 more than anything else.
Seriously though, check out the new tracked changes. Much nicer than before.
The advanced embedded stuff scares me a little. I can see people adding huge videos into a word document and emailing it to 100+ people on a DL. I can see it being abused.
http://office.microsoft.com/en-us/buy-microsoft-office-and-m...