Recently revealed that Starcraft 2 would not have LAN, it seems like Diablo 3 will follow suit.
Bashiok's (A Battle.net community manager) quote was quickly deleted from the forums (link in original article is dead), but a german site managed to catch it. According to the same german page, b.net will still be free of charge.
Original German Source: http://diablo-3.gamersunity.de/text2104/diablo_3_im_battle.net_kostenlos_und_ohne_lan-modus_.html
"More so than overbearing/invasive anti-piracy measures that would affect everyone who buys the game regardless of how they're going to play it instead of just those that may want a LAN feature? I would doubt it.
I don't know a lot about it, Diablo III isn't really facing the brunt of the Battle.net 2.0 features just yet, but I think that removing LAN in an attempt to avoid more severe anti-piracy measures is pretty cool. We're saying "Hey, we're pretty sure you're going to love our game. The multiplayer is really the best part though. In order to get in on that that we'd just like to make sure you bought the game. Cool?"
Bashiok's (A Battle.net community manager) quote was quickly deleted from the forums (link in original article is dead), but a german site managed to catch it. According to the same german page, b.net will still be free of charge.
Original German Source: http://diablo-3.gamersunity.de/text2104/diablo_3_im_battle.net_kostenlos_und_ohne_lan-modus_.html