The special edition will feature additional bosses in addition to the same content as the console versions. (gamewatcher.com)
You must explore and traverse 24 finely crafted levels and additional boss levels across 6 differently - themed worlds. (gamingenthusiast.net)
The finished game will now also include additional boss battles, mine cart stages, quiz show challenges, various multiplayer options, and a simultaneous release on PC, Xbox One, PlayStation... (gamesnosh.com)