aperfectcircle.net:
A few hours ago, the lineup was officially announced for the 35th annual Pinkpop Festival, to be held on May 29th through the 31st. A Perfect Circle was not mentioned, despite the rumors that have been floating around suggesting they would be on the bill. It should be noted though, that there are 4 spots still open. Looks like it's still a maybe, but definitely leaning towards a no.
As for the other festivals, we still have yet to confirm or disprove the rumors that A Perfect Circle might be playing Germany's Rock Am Ring / Rock Im Park, and it looks like APC will definitely not be playing Belgium's Rock Werchter Festival, as by that time (early July) Josh will be tied up here in the states drumming with the Vandals on the Warped Tour