Noted - it *should* play a sound now when it is your turn and it *should* e-mail you as well. But we are looking for other options as well. (Blinking game icon perhaps)
Yea - from here.
http://i.imgur.com/b2kP3Ma.jpg
Or to be honest, any time the game is open that the player is not already in a different online game. e.g. skirmishing while waiting for the opponent to make their move.