I suppose Kernel and Xorg updates will be made available in Linux Mint 13 as Level 4 and 5 updates. If you're concerned about security, you may want to upgrade. Please note level 4 and 5 updates may sometimes cause regressions depending on your hardware.
http://www.phoronix.com/scan.php?page=n ... px=MTU5NTA
https://lists.ubuntu.com/archives/ubunt ... 00180.htmlUbuntu 12.04.4 LTS makes available the Linux 3.11 kernel, packs in Mesa 9.2, and has other X.Org stack updates. There's also other minor new package updates like to Mozilla Firefox and Thunderbird.