Since i posted the above regarding the season 20 box set more details have been published.
The Collection: Season 20 Blu-ray box set also includes extensive Special Features including:
THE FIVE DOCTORS – 40TH ANNIVERSARY EDITION
A brand new version of the 90-minute anniversary special, with updated special effects, Dolby Atmos & surround sound, plus an exclusive new commentary with Peter Davison, Janet Fielding and Mark Strickson.
UPDATED 2023 SPECIAL EFFECTS
Exclusive to Blu-ray, on Snakedance and Enlightenment.
BEHIND THE SOFA
Seven new episodes with Peter Davison, Colin Baker (The Doctor), Sylvester McCoy (The Doctor), Sarah Sutton, Janet Fielding, Mark Strickson, Katy Maning (Jo) and Sophie Aldred (Ace).
BLU-RAY TRAILER
A brand new episode of classic Doctor Who.
IN CONVERSATION
Interviewer Matthew Sweet chats to Janet Fielding and Sarah Sutton.
LET’S GO DUTCH!
The TARDIS crew travel to Amsterdam to revisit locations and reminisce about Season 20 and their time on the programme.
LOOK WHO’S DRIVING
Join Peter Davison, Janet Fielding and Sarah Sutton on an hilarious European Road Trip.
WHEN JANET MET MARTIN
Janet Fielding chats to Martin Clunes, 40 years on from his appearance in Snakedance.
MAKING THE KING’S DEMONS
The regular cast return to the castle location and reminisce.
MAKING THE SEASON 20 TRAILER
A look behind the scenes
LONGLEAT CELEBRATION FOOTAGE
A previously-unreleased look at the iconic 1983 convention, plus panels featuring Peter Davison, Tom Baker, Patrick Troughton, Jon Pertwee and many more.
STUDIO FOOTAGE
Hours of material going behind-the-scenes on production of Arc Of Infinity, Snakedance and The Five Doctors.
ONCE UPON A TIME LORD
A rare US documentary from the 1980s.
RARE CONVENTION FOOTAGE
Including Australian interviews with Peter Davison and Janet Fielding shot during production of this season.
NEW 5.1 SURROUND SOUND MIXES
On
Snakedance and
The Five Doctors. Plus Dolby Atmos mixes on
The Five Doctors.
And here's the gorgeous back cover of the box which features the Black Guardian.
I hope the new documentaries are as with season 19 and made by Mark Strickson. I adored those on the earlier set revisiting the locations of
Black Orchid and
The Visitation.
This sounds to be the best Blu-ray set to date. So much new material included.