While I have not seen these myself, it has been reported that you can see an Original Star Trek Constitution Class Heavy Cruiser, and a FireFly class ship in the fleet views. Has anyone spotted them, or any other ships?

Well there's this thread (http://flare.solareclipse.net/cgi2/ultimatebb.cgi?ubb=get_topic;f=11;t=001439;p=0) that talks about it.