Not too many details yet, but Copia is introducing a bunch of WiFi, e-ink, 3G, ereaders with a twist. Copia will have its own bookstore but the readers will be social network enabled. According to their website:
Sometimes the best part of a book comes after you’ve finished reading. With Copia, you can start conversations, give and take recommendations, and share your opinions and insights. So if you’re bent on proving why “Potter” is better than “Twilight,” chances are there’s someone who would love to prove otherwise.
Connect to your existing social networks
Add past, present and future reads to your library
See live notifications from your friends
Stay up to date on group activity
Share notes, highlights and bookmarks
IMHO, if lending is not supported it isn’t social enough.