Ubuntu already has a generic 3.7 kernel (http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.7-raring/) in the kernel PPA. I'm already running it. Upbuntu usually has a shell script day of to download new releases. New Ubuntu versions are shipped with the latest kernel around the time of commmit freeze and just updates that line to avoid regressions in future kernel releases from harming systems inadvertently.
