I fear posting info for risk of getting flamed, but here goes... take this for what it is worth.
I was in the local T-Mobile store (Northfield Stapleton, Denver CO) today to ask about a Pearl for my wife. While I was there, the manager asked, "you were in here before asking about the Curve, right?" I said yes, and he said, "I don't know much, but I'm going to T-Mobile BlackBerry training next Tuesday (June 19). Supposed to be new stuff coming out in July. They say it is for the Curve."
I played dumb and said, "I thought Cingular / AT&T has an exclusive on the Curve for 90 days."
He said, "yeah, I asked about that. Supposed to be a new Curve, not exactly what they are selling."
He told me to stop in next Tuesday afternoon and he'll let me know what he finds out. May be nothing, but we can keep our fingers crossed, right?