Three other people were able to get in with the link. You may have to upgrade Skype (I had to UG manually on my MAC).
I'm looking to see how easy it is for people to join, what they can see when they join. As of now it looks like you won't see old messages and that three peopel were able to click the link and come right into the group.
Just testing for now -- looking to see what functionality has been added to Skype groups.