Okay, here is what I think. Being that "The number of days until half the web links to Diablo3.com" is on the box, and the reference to 14 days which equates to May 1st. Now May 1st (also known as May Day) has a somewhat significant place as far as Christian holidays are concerned, which quoted from wikipedia.com is,
"May Day marks the end of the uncomfortable winter half of the year in the Northern hemisphere, and it has traditionally been an occasion for popular and often raucous celebrations, regardless of the locally prevalent political or religious establishment."
So Traditionally this day is day of celebration, seems like a pretty far-out-there theory and being that I could find no religious affiliation of the blizzard CEO's this sounds pretty sketchy but I tell you what, I'm sure ready to celebrate any announcement concerning Diablo!
What if all the diablo3 domains that Blizzard has taken, start redirecting to Diablo3.com, rather than Blizzard.com? Consider that a possible theory... Diablo3 domains such as www.diablo3.fr and stuff like that