Here are a few more details on the BB 8800 and 9xxx series phones heading to Cingular. First off, the 8800 is scheduled for mid-February, but will have no camera, no Wi-Fi, and just about the same keys as the 8700.
The 9xxx however, will have Cingular's HSDPA 3G, a microSD card slot for backup and restore, a new processor, improved UI, and is scheduled for a Q4 release. Nothing revolutionary that we can see, but should be worth the upgrade if you're a business user and your company's spotting the bill anyway.
BlackBerry 8800 & 9xxx Series [Boy Genius Report]