Blizzard has confirmed that the scripting language in the SC2 scum editor will be very closely related/based off of C/C++, so start learning C++ if you don't know it already, the more you know the easier it will be to learn the SC2 scripting language. Let me translate this for you.
Learning C++ early + SC2 coming out in a few months + early scripted custom games made by you = one of the first custom games / uber fame
-Bane
Learning C++ early + SC2 coming out in a few months + early scripted custom games made by you = one of the first custom games / uber fame
-Bane