These rumors of the "big anouncement" spread like wildfire about once every six months. Then they die faster than they start. Last time it even carried with it the claim that "you will remember where you are when you hear the anouncement". For added validity I can only assume. If you were flying that day there was no end to the speculation you heard coming from pilots, fos, fa, ops, csa, ramp... The next day... GONE.
Start a rumor on in Baltimore and it will beat you to L.A. They fly way faster that the 737.