The stages are not so big that they hide a lot of secrets, or ever really did. Back when we were kids, yea... it was easy to be ill-informed. As an adult, that's not really a thing anymore. They'd have to make the stages several times larger each for that to be a thing again.
Dead or Alive 5 Last Round is coming to PS4, PS3, Xbox One, Xbox 360 on February 20, 2015 across Europe. Steam release date is now March 30, 2015 worldwide.