More information emerges on the KickstartThis article contains unofficial information.
As far as features go, look for quad-band GSM/GPRS/EDGE (no 3G?!?,) OS 4.6 (the sexy new number found on the upcoming 9000,) WiFi, 2 megapixel camera, 3.5mm headset jack and a"next generation" SureType keyboard. Both displays will be 16 bit color, the internal display is QVGA while the external measures 160x128. The date isn't hard yet, but look for this to land on T-Mobile as early as September.