Fourth ICE AGE film already on the way?

From AintItCool.com:

"Even though Ice Age: Dawn of the Dinosaurs hasn't even hit theaters yet, it seems a fourth Ice Age film has been well underway or the past few months.... the 4th installment sees Manny, Sid, Diego, Ellie and Scrat frozen solid and accidentally defrosted in a museum in present day. At this stage the film is being called 'Ice Age Th4w'. Guess that sees the end of any future Ice Age movies being set in prehistoric times but this could be an interesting new direction for the franchise. This idea also mirrors recent events where a perfectly preserved (Frozen) baby woolly mammoth was discovered on a Siberian riverbank earlier this year."

Not necessarily crazy about the name but if it's true it's like combining Ice Age with Madagascar and Night at the Museum. True, they're all good movies but I mean, really...