Not for the US but your country may charge you an additional import charge. HOWEVER all of the international shipping is discounted by 30-70% so if you do get charged, the idea is that it balances out.
As of now they'll be packaged INSIDE the first printing of the game. So if you get your package and there are no extra cards, they are there :)
The goal is April! This also takes into account a bubble of time in case things are delayed a little bit.
Don't see the answer to your question? Ask the project creator directly.