On top of being the biggest solar panels ever put on a space probe, the furthest out in the solar system we've done solar power, and the extreme radiation hardening they had to do for this mission to even work, the thing I am most excited for is JunoCam. This camera was added almost at the last minute after a campaign to have a visual camera for public outreach.
NASA people are really stepping up their game with these mission trailers.
Perhaps I'm sharing what you and others already know or found out on their own, but this lecture on JUNO helped me a lot to get up to speed yesterday: