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 Concluded", and skip to the credits. Some have "To Be Concluded" followed by "Back To The Future III". Some cable versions retain the teaser for Back To The Future Part III, but, of course, do not say "Coming Summer 1990". It was, however, added back to the film for its digital download and Blu-Ray versions.
The DVD version (Regions 1 and 2) has "To Be Concluded" followed by the teaser for Part III just before the start of the credits.
The DVD version (Region 4) has "To Be Concluded" just before the start of the credits.