One minor quip: If you're using Midas, bosses drop less money in Expert. This usually doesn't tip the scales to making them less valuable to beat in Expert, but I still feel like gaining less resources from bosses in Expert, whatever the reason, is a little weird.
Anybody else: "1.4 is going to have creative mode!" *cricket* Staff team: "1.4 is going to have creative mode!" *everybody starts speculating* "It's just a prank, bro." *more speculation later* and your words are morphed into "1.3.6 is going to be player sudgestions!"