So...Only through the Battle.Net? It's a very shocking news!!

StarCraft II will not have a local area networking (LAN) game mode.

Rob Pardo, senior VP of game design at Blizzard Entertainment confirmed in an interview with IncGamers that the StarCraft II development team "don't have any plans to support LAN," and clarified saying "we will not support it." The only multiplayer available will be on Battle.net.

IncGamers also got a clarification from Blizzard, shortly after the interview, saying the choice of excluding a LAN feature "is because of the planned technology to be incorporated into Battle.net," a topic they will reveal more about at a later date.

The original StarCraft gained popularity largely because of the easy LAN mode, used on massive LANs like Dreamhack or small personal networks between friends, so this is a surprising move by Blizzard.

Besides the full interview, make sure to check out IncGamers' massive StarCraft II preview, videos, screenshots/art and other StarCraft II news from the event.

Source: http://starcraft.incgamers.com/blog/comments/no-lan-in-starcraft-ii-confirmed/