Diablo 3 came with the mail today! The box includes two guest passes for Diablo 3 and one for World of Warcraft.
"The guest account allows your to play Diablo III for free up to the Skeleton King boss in Act I. Note that certain game features are restricted on guest accounts - to remove these restrictions, you will need to upgrade to the full version of the game."Doesn't mention how long it works.
The game was delivered in Finland and ordered from Konsolinet, most Finnish sites ship from the Åland Islands, and they send early and pre-orders are cheaper than retail.