I have only just heard...Ubuntu 8.04 LTS (Hardy Heron) is not here in its final release version yet but the next version has been announced:
Ubuntu 8.10 Intrepid Ibex
As you can guess, it will be released in October 2008 (hence 8.10)...or I should say it is planned to be 8.10 as anything can happen between now and then. I have little other information yet as I still await the official release of 8.04 so I can not comment on what features one would like to see improving.
Also worth noting is that this proposed release will be the 4th anniversay since the release of 4.10, that should be an milestone worth marking.
More information is available at Full Circle Magazine