I didn't think this reunion would be such a big deal, but it was the #1 search term on Google Trends. Here is the official statement I received in an email from Universal Music.

Hi. We're blink-182.
This past week there’ve been a lot of questions about the current status of the band, and we wanted you to hear it straight from us.  To put it simply, We're back. We mean, really back. Picking up where we left off and then some. In the studio writing and recording a new album. Preparing to tour the world yet again.  Friendships reformed.  17 years deep in our legacy.
 
Summer 2009.
 
Thanks and get ready...

More info:
 www.blink182.com & www.myspace.com/blink182