Blizzard RTS community manager Kevyn Yu confirms thatwill be free to use.
Yu“when a player buys the StarCraft II box at retail, they will have the ability to play on the new Battle.net for free.”
There has been a lot of speculation whether or not Battle.net, Blizzard’s updated online gaming network, would be a service players would have to pay for. The speculation arose as Blizzard continously have declined answering questions about how Battle.net will be financed.
Read more about Battle.net and the upcoming beta in IncGamers’ StarCraft channel StarcraftWire.net.