There's been no specific mention of whether this will be HD but I assumed it's upscaled.
Bonus features:
TOM BAKER IN CONVERSATION: A candid new one-hour interview with the Fourth Doctor.
BEHIND THE SOFA: Classic clips from Season 12, viewed by Tom Baker, Philip Hinchcliffe,
Louise Jameson, Janet Fielding, Sarah Sutton and Sadie Miller
NEW MAKING-OF DOCUMENTARIES: For The Sontaran Experiment and Revenge Of The Cybermen
IMMERSIVE 5.1 SURROUND SOUND MIXES: For The Ark In Space and Genesis Of The Daleks
OPTIONAL BRAND NEW UPDATED SPECIAL EFFECTS: For Revenge Of The Cybermen
GENESIS OF THE DALEKS – OMNIBUS MOVIE VERSION: Unseen since broadcast in 1975
THE TOM BAKER YEARS: The 1991 VHS release, on disc for the first time
PRODUCTION ARCHIVE MATERIAL: PDF files from the BBC Archives
(Note: Earlier artwork had "Season 12" on the box and no mention of Tom Baker)