When you want to join to the old 1.0 server version, then will pop up a window with question, if you want launch your old MTA client 1.0.X
But I think we should to wait at least some time, when the most of the players get the informations about new 1.1
//EDIT : By the way, did you try the "Z" voice? For me it does not work or I do not know...