"- Which languages are planned for Overture?"
We will try to support the major European ones: English, French, German and Spanish at a minimum. I can not answer this qith 100% though since alot of translation might not be done by us.
"- Is there some spoken language in the game, or just in the introduction?"
There is voice acting ingame.
"- Will unicode be supported?"
Not at release.
"- Has the translation already started?"
Nope.
"- Do you have already a translator for German ? :-)"
We will be looking for people when and if the time comes. So keep your eyes open if you are interested