If that's true, I'm very exciting to have an @Facebook.com mail address. But that's not all I wish.
I wish there will be a killer not just to gmail but to email.
There are many email based products including gmail. It will not change anything to have one more. Email is probably an oldest thing on the internet. It's just like an undead dinosaur. Old, fat, and slow. And it might be the most insecure thing in the Internet world. However, people still relied on it nowadays.
Web is old too. But it changes a lot. From static to dynamic and from HTML 1 to HTML 5. But email still keep the same face as it was.
Gmail redefines the way people using web mail. A web mail is just an interface for people to receive and send their mail. But inside, still the email. Nothing changed. Google wave tried to take evolution over the email. But it failed. I think that it doesn't define very clearly what it should change. that makes it also fat and go into wrong direction.
Social services have good chances to change these. It's still young. It's still keeping changing what user interact to each other over the Internet.
However, it's not easy to change. Because people already get used to the email and rely much on it.
Hope it might be a good start.
Posted from my iPhone