I personally think it would be wise of Blizzard to post tomorrow - "April Fool's, Blizzard fans! On the other hand, we are announcing BlizzCon 07, set for this summer!"
Well, I just logged onto www.blizzard.com and saw they were announcing "Warcraft: Heroes of Azeroth". I visited the site and it looks like Warcraft III turned RPG. I'm pretty sure it is another April Fool's prank, due to the noticeably poor editing of the Warcraft III box covers.
Wouldn't that make people a little more anxious?!
http://www.blizzard.com/whoa/