Its nothing special;

bug fixes, main menu UI redesign, performance improvements and 2 new codes.

Don't worry! I have a lot planned for V4.75 and 4.8! while those updates (4.7 too) aren't going to "revolutionise" the game like 0.6 did, they should add some variety into the game! (also RATBT2 pro might be back for a bit lol)