WordPress 3.3 was released yesterday. I’m loving the new interface and the drag and drop media uploader! We have been testing our themes on 3.3, and with each release candidate, and have not experienced any problems. If you are using the latest version of your theme then you should ok to upgrade. Don’t forget to always backup your website before updating WordPress. You can learn more about 3.3, aka “Sonny,” here: http://wordpress.org/news/2011/12/sonny/