A sneak peek of "Ice Age 4: Continental Drift" is actually included in "Gulliver's Travels". The short film titled "Scrat's Continental Crack-Up" features Scrat, a Jurassic mix-up of a squirrel and a rat, which finds himself in an endless series of pain-inducing situations (which he is already famously known for). Without spilling too much, it essentially sets Scrat into the deepest crevices of the Earth. You can catch the 20-second sneak of the short after the jump or even better, just watch "Gulliver's Travels" and get to watch the whole short in its entirety.
"Ice Age 4: Continental Drift" is scheduled to be released on July 13, 2012" to be distributed by 20th Century Fox.