Beta downloads for Ubuntu GNOME 13.10, Lubuntu 13.10, Xubuntu 13.10, and Xubuntu 13.10 are available for download. The Unity version of Ubuntu will be available later this month.
I recommend taking your favorite beta for a spin in VirtualBox. VirtualBox is free, open source software. It’ll give you a taste of what the beta has to offer, without actually installing it on your daily use computer.