Along with a max of 5 images, youtube should now be embedded. Vocaroo's embedded too, but I can't really imagine a use for that.
Test:
https://www.youtube.com/watch?v=ulFrCqMobCkCountry flags and poster id's will remain off to maintain anonymity, displaying SAGE! after saged posts seems outright silly, and an image for the OP is required. Being able to format math between $$ and Oekaki both seem unnecessary, but I don't mind turning them on if you guys want it on.