I think its the newest version :) I'd have to go home and check.
Getting the certificate and provisioning profile to work and link together gave me problems though - once I fixed those it was easy. But I only had issues because I had been messing around with various profiles a few weeks ago.
I've just heard back from Ludei. They have now successfully used a Mac Mini running xcode 4.2 to sign the cocoonjs cloud bundle!!! Great news for me and they acted upon my requests very quickly - looking good, thanks Ludei!