White House teases April Fools' Day joke? Twitter teases mockery; Update: April Fools' Day video

From the White House Facebook page:

At 10:00 a.m. ET, the White House will release a special video message from the President, available only at http://wh.gov/

Twitter starts making announcement predictions.

Zing! Will the joke fall flat? Can it top the joke that is currently in the office? Stay tuned.

Update: The prank.