Here is the final debdiff. I changed ftplugin/debchangelog.vim to use already "production" (even if it really works with the next LP rollout on 2010-01-27) and replace my temporarily hack with a proper fix.

vim (2:7.2.330-1ubuntu1) lucid; urgency=low

  [Michael Bienia]
  * Merge with Debian unstable (lp: #509900). Remaining changes:
    - debian/runtime/vimrc: "syntax on" is a sane default for non-tiny vim.
    - runtime/syntax/debcontrol.vim:
      + Add "metapackages" to the list of valid sections.
    - runtime/syntax/grub.vim:
      + Add Ubuntu-specific 'quiet' keyword.
    - Drop vim-lesstif package and lesstif2-dev build-dependency.
    - Enable Python interpreter on basic builds.
    - Rename Vcs-* to XS-Debian-Vcs-*.
  * Apply patch from Ted Gould to highlight Breaks in debian/control
    (lp: #498303).
  * runtime/ftplugin/debchangelog.vim: Use python-launchpadlib (and LP API)
    instead of python-launchpad-bugs for bug completion for Ubuntu
    (forwarded to Debian as bug #566841).
  * src/configure.in, src/auto/configure:
    As MODLIBS from python's config/Makefile includes LOCALMODLIBS which
    shouldn't be used and breaks the build with newer python versions, use
    BASEMODLIBS instead of MODLIBS (forwarded to Debian as bug #566842).

  [Colin Watson]
  * Add Launchpad integration to the Help menu if launchpad-integration is
    installed (lp: #453103).

 -- Michael Bienia <email address hidden>  Mon, 25 Jan 2010 15:04:01 +0100

The new Debian changes:

vim (2:7.2.330-1) unstable; urgency=low

  * [34a85b6] Update README for patches 285 - 330
    - [1aee41b] [7.2.294] when using TEMPDIRS dir name could get too long
      (Closes: #544682)
    - [f3ea2c2] [7.2.300] file descriptors not closed when executing external
      command (Closes: #290507)
    - [f3ce928] [7.2.324] a negative column argument in setpos() may cause a
      crash (Closes: #563071)
  * [fd76420] Sync runtime files
    - NetRW updated to handle 'equalalways' being set, but window sizes not
      being equal.  (Closes: #346089)
  * debian/control:
    - [49f131e] Add Depends: ${misc:Depends} to all binary stanzas.
    - [8973628] Bump Standards-Version, no changes required
    - [12ac9a3] Remove Pierre Habouzit from Uploaders.

 -- James Vega <email address hidden>  Thu, 14 Jan 2010 00:21:04 -0500

vim (2:7.2.284-1) unstable; urgency=low

  * syntax/debcontrol.vim:
    - [b997413] Add highlighting of Breaks field (Closes: #541989)
    - [05a38bf] Recognize lpia and kopensolaris-i386. (Closes: #543207)
  * [a85b832] Update README for patches 246 - 259
    - [669e098] [7.2.256] GTK font dialog doesn't have a default when
      'guifont' not set  (Closes: #307158)
    - [f4ed8fc] [7.2.257] GTK 2.17: lots of assertion error messages (Closes:
      #545168)
  * [83583c3] Add Ubuntu's next release, lucid, to the Debian-related runtime
    files.
  * [87f3b00] update-runtime: Use -A option for git-add so deleted files
    are committed.
  * [60cbb45] Sync runtime files
    - Updated remind.vim syntax file. (Closes: #536770)
    - Fix typos in Japanese vimtutor. (Closes: #539577)
  * [96dca67] Move html docs from /u/s/d/vim-common/html to /u/s/d/vim-
    doc/html.
  * [9fec1cd] Use usr_toc.html for the usermanual Index page.
  * [fbacb18] Update README for patches 268 - 284
    - [76d3dad] [7.2.283] GTK: changing font doesn't keep the window maximized
      (Closes: #466088)
  * [6e51684] debsources.vim: Recognize rc-buggy (alias for experimental).
    (Closes: #553525)

 -- James Vega <email address hidden>  Sun, 08 Nov 2009 16:51:59 -0500