BBenve: You don't know that he doesn't have an early build of 10.3.
What if the new version has applications with those icons? What if he put those icons on another application that he has? What if he somehow copied the applications from the server version onto his normal version of the OS?
There are many ways that he could have put those icons in his dock, and you can't know for sure.
My person opinion, however, is that he is just having a joke with us.