Starcraft – How to change the language after a patch

According to a post by a Blizzard employee, you might be able to play with your friends no matter where they are:

Getting people online, playing and interacting is obviously the overall goal for the Battle.net platform, and that includes allowing people to play across regional boundaries as they have in the past.

Unfortunately, there are a multitude of challenges we have to overcome due to the unique regional account and billing options that didn't exist in the past. But those hurdles aren't insurmountable, and we are looking into solutions that will allow interested players to obtain access to other regional versions without having to buy another full copy of the game. Those solutions are something we're currently planning to have available through Battle.net Account Management within the first few months of StarCraft II's release.

Before that solution is implemented though, you're correct in that you'd need to purchase a US copy of the game on launch day to play in the US region.

However notice that he is talking about a potential future feature which may end up not getting implemented (or not implemented in a satisfying way), so in the meanwhile I would be careful about which version to buy.

A full list off all hotkeys can be found here, under the keyboard advertisement.

But they are also listed in Menu (F10) -> Options -> Hotkeys, as seen in the next picture.

Hint: You can also set the Grid profile there, so you don't even have to learn the in-game hotkeys.
That profile maps each Grid Command Buttons to rows of keys on your keyboard.

This greatly decreased finger movement and allowed me to increase my APM a bit...

So a Refinery would be: Z E, a Supply Depot: Z W.

Z is then the lower left button, W and E being the second and third button on the first row.

Source: http://www.starcraft2freaks.com/how-to-use-starcraft-2-grid-hotkeys/

Warning: If you don't have the US keyboard locale installed, the grid profile does not work (it just uses the standard profile although the Grid one is selected in that screen -- it also changes the hotkey for warpgates from W to Y among a few others, very messy)