Well, that was some good news! I have a corporate account with Cingular, so I called on behalf of myself and two others at my company to find out what our options are. All three of us have 650's that were provided by Cingular, but only with one year contracts [I typically go for a one year contract instead of a two year... yes, it costs a bit more, but A) its still carrier subsidized and cheaper than an unlocked version and B) it allows you to upgrade sooner]. In the case of the three of us, all our phones were out of contract. I was told the price to upgrade, with a two year contract, was only $179.99... $20.00 cheaper than the $199.99 advertised price for a two year contract with new service. Can't beat that. I was tempted to go for an unlocked 680 with the music bundle, but the fact is, I already own PocketTunes Deluxe, already have a 2GB memory card, and already have the Palm stereo headphones. So for me, the music bundle really wasn't worth it and the corporate cost is less than half of the unlocked price straight from Palm (besides, Cingular is known for providing unlock codes if requested, just like T-Mobile).
One thing I'm still intrigued by is a rumor/comment made on TreoCentral of supposed future 680W's and 750P's. In the case of the latter, that would imply a PalmOS Treo 750 with UMTS/HSDPA??? That's what I've been hoping for. But I'm also not waiting. Its still a rumor from a comment made by a supposed manager at a Cingular store. My 650 has done me well for the last year or so and its time for an upgrade.