How much do you know about the Ubuntu release cycles?
First off, the version numbers are simple, year.month. Ubuntu 9.04 is scheduled for release 04/23/09. Therefor, the version becomes 9.04.
Secondly, the Ubuntu has an $adjective $animal naming scheme. The third public release is the first that began at the beginning of the alphabet. They have been moving up one letter in the alpabet since then. My personal for for 10.04 is Leaping Lynx.