 The theatrical version had a teaser for _Back to the Future Part III  (1990)_. Some later versions do not have a teaser at all, only showing  "To Be Continued", and skip to the credits. Some have "To Be Continued"  followed by "Back To The Future III". Some cable versions retain the teaser  for Back to the Future Part III (1990), but, of course, do not say  "Coming Summer 1990".