Busy with it, but you are a bit too early.
Documentations will be posted on teir website "within days".
So fa all rpm install on SME 5.5U6. Only 'glitch' is that ther are reports of not being able to find a certain user.
But then again, opengroupware.org 'warned' about install issues on their website.
Be patient, give feed-back to the proper lists and we all benefit.
Thanks.