The Doctor Who Restoration Team website has published an article confirming the release of the K9 Tales box set later this year, and announcing the extras package being provided for the two stories - 1977's The Invisible Enemy and 1981 spin-off adventure K9 and Company.
The extras for The Invisible Enemy are:
A commentary Louise Jameson, John Leeson, Mat Irvine and Bob Baker.
Documentary feature Dreams and Fantasy, looking back at the making of the story.
Studio Sweepings - behind-the-scenes studio footage.
Visual Effect - a look at the visual effects work on this and other stories.
Blue Peter - an extract showing K9's first appearance on the famous children's magazine show.
Optional CGI effects.
Trailers and continuity announcements, on-screen production notes, a photo gallery, coming soon trailer, and PDF files of Radio Times billings.
On K9 and Company:
A commentary with Elisabeth Sladen, John Leeson, Linda Polan and Eric Saward.
The K9 Files - a documentary looking at the making of this production.
K9 - A Dog's Tale, K9 is interviewed about his life.
Pebble Mill at One - K9 appears on the BBC1 lunchtime chat show.
BBC trailers and continuity announements.
PDF files of K9 Stories, four books starring the dog originally published in the 1970s.
A Photo Gallery, Coming Soon trailer, Radio Times Billings PDFs, Programme subtitles and Subtitle Production Notes.