Note that the new supers are Nightstalker (for the Hunter, it's a void bow and arrow), Sunbreaker (for the Titan, it's a solar hammer), and Stormcaller (for the Warlock, it's an electric shock wave that is conducted from your hands).
For the Nightstalker, I dunno what to say other than I'm ready to FSU.
For the Sunbreaker, I would say "it's hammer time."
For the Stormcaller I would say, "I am Papaltine!"
Edit: some popular phrases out there include:
For the Nightstalker, "peeeetaaaaa!" "bitch, I'm Legolas"
For the Sunbreaker, "I see Bob the builder is trying to fix his KD," "STOP, Hammer time!."
For the Stormcaller, "Come to the arc side" "come to the dark side Luke."
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Hunter - Keep count Gimli Warlock - Bwahah Zaaaaaap!!! Titan - I have Da Powa!!!