For any users interested in migrating Pywikipedia-based bots from the Toolserver to the new Labs platform, or just interested in using Labs to run bots, I've written a page[1] describing the steps I took to get my bots running under the rewrite branch.
If someone who uses trunk has gotten their bot(s) running on Labs, feel free to add instructions for that process, too.
[1] https://wikitech.wikimedia.org/wiki/User:Russell_Blau/Using_pywikibot_on_Lab...