Yahoo! has posted the theatrical trailer for Shrek Forever After. The DreamWorks animated film will be the fourth and final ‘Shrek’. We see a different Shrek this time around. He’s no longer considered a mean ogre to people, but more of a celebrity. He makes a deal with Rumpelstiltskin and ends up in an alternate version of Far Far Away. Shrek Forever After will release in theaters May 21st, 2010.