Hey ho!
Finally, after the last import got interrupted, we got a fresh planet import on cassini with the additional fields. It took around 28 hours because of the new text-fields, i think. As cassini has no java, I can't run osmosis and start the diff imports, but as river & marcin agreed on a plan to make ptolem the new toolserver-db, we should maybe wait for this to happen before putting any more work in cassini.
The script I did the import with can be fetched from here: http://cassini.toolserver.org/~mazder/planet-update
Maybe it will be helpful un ptolemy, too.
Peter