There have been more than a few viruses that are timed to be released on particular dates. I'm sure the creator of this one thought April Fools was a good date and it's not the first virus released on that date.
And as I said, it wouldn't be the first one to be released on that day as a hoax either. I am not saying it is, and I do agree everyone should be prepared, but I also don't want everyone getting into a huge panic over it. Just make sure you have a good UP TO DATE anti-virus program and if at all possible, DON'T use your computer. Let's just hope it is a hoax.