Update 7/26: The iPAQ 6315 has been released and T-Mobile will start selling it in August at $499 (presumably with a new 1 year contract/service agreement).
Update 8/15: More info available here.
ipaqabilities.com has found a photo of the upcoming ipaq h6315 on the T-Mobile web site.
Description is “HP iPAQ h6315 Pocket PC is a Microsoft® Windows® powered Pocket PC that integrates GSM / GPRS, Wi-Fi, and Bluetooth wireless technology to give you high-speed wireless voice and data connectivity at home, at work, and on the go.”
Release date is rumored to be July 27th.
If I hadn’t just bought a new Dell Pocket PC and a Sprint PCS phone I would be very interested in this.