I doubt any news portal would be spreading false news as a joke during April Fool's day. They would be risking their credibility. Not everyone waking up remembers that it is the 1st of April. Reading a fake (joke) article from their news portal they follow daily would end up making them take seriously bad decision and that news portable will be blamed and might be held liable. The portal can't defend themselves saying "it was a joke!".
Since I know bitcoin their was never a time I observe any form of April fool and it won't be funny, I believe it can't take place. I'm still wondering how the bitcoin prank would be like because it will change so many people mood, April Fool for bitcoin can never be possible. I think bitcoin is too important to be a joke