I have seen this also. But when I get it, it lists the other required techs below the statement "# more techs required for {shipname}". I would suggest trying to scroll down the tech description and see if they are listed. Not sure how this has been changed in the beta, if it was touched at all.
Marc, I see this with user defined ships, not core ships. It's listed in the tech description on what that tech releases. Same place it shows what buildings become available, ect.
I would give you a screen shot, but i am getting my ships folders cleaned out, and the latest beta running (still problems with that) and it will take a couple of games to get it displayed again.