The unwritten rule of the painfully obvious corporate April Fool trick is that you try and trick your customers into believing you're about to do something really silly or strange. It's probably not such a good idea to promise things that your organisation would like to be able to do, but can't actually deliver. That only disappoints anyone naïve enough to fall for it and emphasises how far short of these aims lies your reality.
(Hence the general lack of "Cure found for Cancer" headlines amongst the April Fool press releases)