Here's the new edition, with a cover design by an entity called YES (using a number of Munari's pictographs), and the original Pelican edition from 1971 with cover by Munari and the great Germano Facetti. (UPDATE: YES has a website full of their drool-inducing work, mostly outside of the books field; thanks to Daniel Gray for the information.)
The second book in this series is Susan Sontag's immensely wise history/philosophy book, On Photography.
(UPDATE: This is not the final cover, as it turns out, though it is the version that appears on Penguin's site as well as every online bookseller. Until the real book appears in Australia and I can photograph it, you'll need to visit Daniel Gray's excellent blog to see it.)
(UPDATE 2: See the end of the post!)
Every other edition of this book, both American and British, has featured exactly the same cover image: a striking 1850s daguerreotype by an unknown photographer.
John Berger, blurbing Sontag on the 1979 Penguin edition above, is the author of the third book on the series, Ways of Seeing, from his 1972 TV series.
Title type and publisher logo aside, this book has not changed at all in over 30 years. Here are the 1970s Pelican edition and a 1990 Penguin edition.
Finally, there's Marshall McLuhan and Quentin Fiore's The Medium is the Massage.
This looks very different from its 1967 original.
Bonus fact I only discovered today: Germano Facetti collaborated with Chris Marker on the great and moody end-of-the-world, nuclear-apocalypse, time-travel short-movie 1962 masterpiece La Jetée. Here's the cover of the photo-novel (or 'photo-roman') of the film.
UPDATE THE LAST: YES were kind enough to allow me to use this image of the whole set of Penguin Design Classics, which includes the final Sontag cover. Please click for a bigger version.