Palm has leaked a Flash presentation at learning.palm.com (by now: removed already), a presentation that revealed existence of Palm Treo Pro, probably a GSM phone that Palm will soon release:

Some certain (covered in that presentation) highlights about  Palm Treo Pro:

• form factor: typical Treo, i.e. front facing QWERTY keyboard and square display with touch-screen (not specified but resolution probably is 320×320)
• WiFi, including WiFi button
• microSD card slot
• microUSB connector
• standard 3.5 mm stereo miniplug – something that iPhone 3G has but also something, that HTC fails to understand

More info here