I don't know... it depends how high Continental Drift grossed at the box office. And sadly, from what I gather from reviews and everything, it was pretty low. Although, who knows - Blue Sky might be able to afford to sqeeze out one more sequel. It wouldn't really do the franchise any justice, and personally I'd prefer a prequel or something, but hey.
Yes! It was confirmed by Chris Wedge, but no information has been released on the subject. It was confirmed in an interview with him about the movie Epic. The interviewer asked about it and said that the next one will come soon, but they need a story. Frankly, I think they should bring back Roshan, aka "Pinky", into the story again. It would be nice to see another emotional scene between them when he is a teenager or something like that. :D
I think there should be a 5th one to give the franchise closer. they should bring buck and Roshan aka the baby in the first movie. i think that would make the perfect ending to the great movies. even though the 4 was not the best maybe they can come back with a great 5th movie. Buck and Roshan would really make it great.
im pretty sure there will be ive noticed in all the movies there are hints on what the next movie will be first one sid said global warming leading into the second one manny said he was the biggest thing on earth then one of the other animals said well what about the dinosaurs which led into number three in the third movie if you look at the ground when sid gets chased by the buffalo the snow looks like the world now and in the forth one one of the pirates had bucks knife which means buck is going to be back in the fifth one