[SiZeMaTTeRs]

We’re excited to announce that access to the North American Battle.net servers will be available following the release of StarCraft II: Wings of Liberty Patch 1.1.0. With this patch, the in-game region selector will be made available so a separate download will not be necessary to access the NA region.

Frequently Asked Questions (FAQ)

Q: Who is eligible to play on the North American servers? How much will this cost?
A: All players, including those in the regions of Hong Kong and Macau, who purchase the English Southeast Asia/Australia/New Zealand standard or Collector’s Edition of StarCraft II: Wings of Liberty will have the option of playing on the North American Battle.net servers in addition to the Southeast Asia/Australia/New Zealand servers. The option to play on North American Battle.net servers will come at no additional cost to players who have purchased the Southeast Asia/Australia/New Zealand version of StarCraft II: Wings of Liberty.

Read more below..

Source: http://sea.battle.net/sc2/en/blog/72596