Wait, they moved up the release to this year? Awesome!

Last I checked, they had it slated for a Summer 2014 release and I had been in withdrawals sometime last fall when the trailer made its second round on the net (the trailer came out in late 2011).
The plot is that the crop duster is competing in a round-the-world air race. So, basically Cars 2 in the air. Should be interesting though. If they follow their previous model, we will get to hear the voices of a lot of people we might know well even if the rest of the world may not, just as they did with the Cars movies using the voice talents of many race car drivers (and one crab boat captain...

).
I will say that their rendition of the Super Bug has grown on me since I first saw the trailer.
Edit: Found a couple of interesting posters posted on the Pixar wiki for the release -
http://pixar.wikia.com/Planes?file=46f7ae8.jpghttp://pixar.wikia.com/Planes?file=7fdaa79.jpgThe first poster shows "Skipper" with "Dusty". Skipper is being voiced by Stacey Keach. The second shows "Ripslinger" that looks to be an NXT.