So, this is from the tor website:
"I live in North America but my friend lives in Europe. Will we be able to play together on the same server?
Yes, it will be possible to play on the same server as your friends. Any player of Star Wars: The Old Republic can choose to play on any server. However, if you choose to play on a server outside of your own region (i.e., – playing on European servers from North America, and vice versa), because of natural latency caused by the distance between your client and the game servers, you may find your game performance is impacted."
And that's that I suppose. I guess it'd be better if us on the Europe side play on an American server since there are more of you guys.