C++ like language. Very similar to NWN Aurora. I can't really program stuff on C++ but I did some awesome scripts for NWN, so you don't really need to go into depths of language.
Swens said that skills/spells are made with some kind of excel sheet, not via scripting. Scripting is used for questing stuff. but there are no details known as of yet
"I don't make games to make money, I make money to make games". (Swen Vincke)