Simpsons stamps in the US... April Fools?

I'm wondering if this one is this years big joke... can't find a single story on it prior to today, and nothing on the US Postal Service site...

The Simpsons to appear on series of U.S. postage stamps? D'oh!
April 01, 2009
The Associated Press - Web edition

WASHINGTON - Don't have a cow, man! The U.S. postal service says the Simpsons will appear on their own postage stamps.

It's been 20 years since Homer, Marge and family invaded the airwaves on Fox television, and the Postal Service says it plans five stamps featuring the couple and their offspring, Bart, Lisa and Maggie.
No word on their dog, Santa's Little Helper.

And it seems that even Mr. Burns was not able to pull enough strings to get his own stamp.

Artwork for the 44-cent stamps was done by Simpsons creator Matt Groening and will be available for preview online April 9.

At that time the post office plans to announce the date the stamps will go on sale.