Going to buy my tickets tonight (from the Netherlands). i'm really happy to see Gorillaz, A Perfect Circle and Stone Sour, which is still on my to see list. Then i also like to see Marilyn Manson, Avenged Sevenfold, Foo Fighters, Bullet For My Valentine,, Enter Shikari, Good Charlotte, Body Count etc.
Thirty Seconds To Mars is not a real headliner for me. So i hope they add a 4th headliner like Depeche Mode or Pearl Jam (Pearl Jam is a rumor for Pinkpop this year, so why not for RAR?).
Further options I woud like to see:
Alice in Chains, Anti-Flag, Arch Enemy, Ghost, Helloween, Limp Bizkit, Macklemore, Mad Caddies, NOFX, OK Kid, Queens Of The Stone Age, Sabaton, Stick To Your Guns, The Charm The Fury, The Hives. The Offspring, Turbonegro. Which are touring in Europe around RAR/RIP.