OCaml revision in Ubuntu for a given release depends more or less of the OCaml revision in Debian unstable at the time the Ubuntu release is started. Here is a short reminder of OCaml revisions for recent Ubuntu releases:

  • Hardy Heron (8.04): OCaml 3.10.0
  • Intrepid Ibex (8.10): OCaml 3.10.2
  • Jaunty Jackalope (9.04): OCaml 3.10.2
  • Karmic Koala (9.10): (probably) OCaml 3.11.0

As a reminder, the current official OCaml release is 3.11.0 and Debian unstable is currently also migrating to 3.11.0 (you can see its progress on Debian OCaml transition monitor). The probability is high that this transition will be finished or at least in good shape before the Debian Import Freeze of Karmic on June the 25th.