No, you launch the streaming client and login but can't pick any servers...
Rift's doing pretty well, getting content updates, still decently populated on at least some of the servers and has server transfers available if you find you're on a dead one.
Good to see them add a streaming client, should let people get in and play a lot easier. And they have a free-till-20 unlimited time trial. People should check it out if they want something a bit different, MMO-wise.
"Wasabi is a sometimes food." - Elmo