The co-productions from ITV Studios and Shiver will be shown during the anniversary week, in which a tram will crash on to the street.
A 90-minute special, Coronation Street: The Big 50, will "celebrate half a century on the nation's favourite street in grand style with the ultimate Corrie quiz". Superfans will be pitted against cast members in a test of their knowledge of the last 50 years.
Also airing during the week in December will be two one-hour specials titled Coronation Street: 50 Years, 50 Moments.
The two-parter will tell the stories behind 50 iconic plots that helped "define the contribution" the ITV soap has made to British television. The countdown will feature past and present castmembers, writers, producers and directors talking about the how the storylines came to screen.
The 50 moments have been chosen by a distinguished panel which includes Corrie creator Tony Warren and actor William Roache. Fans will also be invited to get involved, with votes cast on the official website determining the order of the moments.
Specific details on when the specials will air have not been confirmed.
> Tony Warren reveals Corrie live excitement