Honestly, there has never been a gaming April Fools that I have fallen for.
Things like Lego Zelda and the Zelda movie are obviously fake to me.
Some people on the VC-Reviews forum might have stumbled upon the VC-Reviews/WiiWare World April Fools prank because someone discovered a new Goldeneye VC page on their site that was blank except for a basic "Hello, World" type message. It was pulled down hours later.
I'm actually excited to see what sort of shenanigans the different game sites pull off for tomorrow. It's like a gaming holiday of sorts but instead of decorations you get fake news articles and in replacement of parties you see gullible fanboy's hearts stirred in a flurry of joy and confusion.
EDIT- Sloop Lirpa is the greatest game development studio on the planet. They are one of those 'ninja devs' that don't take credit for the work they do. They've been involved with major projects like Zelda, Final Fantasy, Metal Gear Solid, Rock Band, Pikmin, Kid Icarus, Kirby, Wario, Gears of War, Mario, Contra and Halo. They do good stuff.