Howto perform OpenStack upgrade from Essex to Folsom on juju maas

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http://askubuntu.com – Following the tutorial on https://help.ubuntu.com/community/UbuntuCloudInfrastructure i've set up a small OpenStack environment on juju and MAAS. One problem is that it only runs essex. To me it seems strange since grizzly is coming soon. Watching this video http://www.youtube.com/watch?v=bcwqvAFBQVg&t=18m47s seeing how easy Shuttleworth updated his essex to folsom i tried that approach, but that just made config errors. So how is the approach - how can i update it easily? And which charms to use? (HowTos)