We already knew that there was going to be a fourth film and fifth film (news article here), but now we have a date.
DreamWorks Animation and Paramount have announced that the fourth installment in the Shrek franchise will be released on May 10, 2010.
Head of DreamWorks Animation, Jeffrey Katzenberg also once again affirmed that there will be a fifth installment (all signs point to 2013 for that one).
So get ready, the next Shrek is just a shade under three years away! ;)