Comment 4 for bug 924437

The link is in fact to:

  http://www.ubuntu.com/getubuntu/releasenotes?os=ubuntu&ver=12.04&lang=en

... where "ubuntu", "12.04", and "en" depend on the details of the current installation. If that redirects to the front page of www.ubuntu.com, that's a problem that should be reassigned to canonical-website or ubuntu-website or whatever it is, I forget which.

Having this on the network rather than on the ISO is by design despite the problem you point out, because release notes are more often than not written after the ISO images have been finalised. The release notes on the ISO wouldn't help.