Chase Flexible Credit Card 0% Balance Transfer Fee (existing customers only?)

I received a balance transfer offer in the mail from Chase yesterday with the "blank" checks which I usually shred, but I decided to check this one and it had a 0% balance transfer fee. There is a 0% APR through your billing cycle that ends in 05/2012. Transactions must post to your account by 07/31/2011. I'm not sure if you can use it for cash advances.

I looked on Chase's website and I don't see the Flexible card listed, so I assume this would be for existing card holders only. Logging into my account, I did see a balance transfer offer with the same 05/2012 date, but it did not state any of the details without first putting in some info that I didn't care to do at the moment.