Hi Benji! Changes in the hardcover/GotY Edtion are: 1) solo rules, 2) one additional fake ad 3) 6 extra pages of art 4) a reworked Attitude ability for The Smarts 5) minor typo fixes. The extra art is from the awesome poster-maps we made for the GotY box edition.
All extra content will also be in the 1.3 update to the PDF, which previous owners get free. :)