According to this article on Wired:
"Starting March 30, Netflix geeks in the US will see some new (old) favorites to add to their queues, including Adventure Time, Aqua Teen Hunger Force, Green Lantern, Johnny Bravo, and Robot Chicken."
The agreement includes complete previous seasons of both animated and live-action programming from Cartoon Network, Warner Bros. Animation, and Adult Swim (and Dallas, though if you’ve been dying to relive that, you’ll have to wait until 2014). You’ll be seeing Ben 10, Regular Show, The Boondocks, andChildrens Hospital all at the end of March.This is great news! Is there anything specific you're looking forward to finally being able to stream on Netflix Instant?