Per their blog, there are several notable things today:
1) The iPad app is out, so if you prefer reading on the iPad, have fun. (You do need to be running iOS7 – the join page, linked below, has device specifics info.)
2) They’re removing the invitation system (and you get a free month trial) – you can join here.
3) They’ve added the ability to browse their catalog on the website (you still can’t search, but if you’re trying to decide if there are enough books you might want to read, the browsing will be a big help.)
I’m still very happy with it, but I know there’s a number of people who were interested in finding out more, or who were waiting for the iPad app.