Yeah, I've played Diplomacy a little bit, but only to check out the new stuff for all the races. I haven't played a proper game yet. There are two new difficulty settings: Cruel AI and Vicious AI. I hope that they live up to their name.
Not all the features are available yet, the changes to the pirates have not yet been added. The Diplomacy tech trees are similiar for all races. I would post screenshots but firefox won't let me.