These are the new wallpapers that are available for Linux Mint 15. The railway one is very beautiful indeed.
And the new MDM customisation application. This allows you to select new themes for the login manager.
The new software manager allows users to select from categories and install software very easily.
The Release Candidate of Linux Mint 15 came with kernel 3.8 and Firefox 20. After installation the updates should be available to upgrade to Firefox 21 and the new 3.9 kernel. All in all; this is an outstanding and beautiful Linux distribution. I am about to install this on a spare partition and then see how well it really works. The Virtualbox Guest Additions are already installed so it works out of the box. Give this Linux distribution a try and see what you think.