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Upgrading ubuntu release on a cluster of servers

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http://serverfault.com – I have a cluster of about 50 ubuntu nodes which are currently running maverick release. I'd like to upgrade them to oneiric, but I'm having a difficulty choosing the right tools. I know ubuntu has the 'unattended-upgrade' utility, but it's only meant for security upgrades and cannot switch the whole release. Is there anything similar that can? For now it seems that the only choice is to use something like fabric/pssh/capistrano and make it run 'do-release-upgrade' on each of the servers. But 'do-release-upgrade' is interactive and requires some input from the user during the upgrade. There d (HowTos)