The new trailer was released for ‘Shrek Forever After.’ This is the fourth installment of the Shrek franchise (in case you missed the pun in the title). In total, the ‘Shrek’ films have grossed over 2 billion dollars for Dreamworks. Given that number, I imagine Dreamworks will pump out at least 20 more of these films. The planned release is May 21, 2010. Watch the trailer below.