This pissed me off this morning. I had read about it yesterday, but what the joke also does it change how the autoboot works. Even when you set preloader to autoboot to the system menu, as long as it's Apr 1, it will bring up the message, and then go to the preloader screen.
Now, I have found that if you change the date (eg. Apr 2), then that "Repairing" screen does not come up, and autoboot to the system menu works fine.
Great work on preloader. I didn't want to upgrade to 4.0 until preloader was avaliable, so now I can go get a big SDHC card for all my GHWT/RB2 DLC.
Hope that info helps with anyone annoyed with preloader today.