Galaxy Tab will be released on September 16th and will be going to Sprint, AT&T and Verizon. Speculated costs of the unit are any where from 200-1200 dollars depending on carrier. Some of the features are,

OS
Android 2.2 (Froyo)

Display
7.0 inch TFT-LCD, WSVGA (1024 x 600)

Processor
Cortex A8 1.0GHz Application Processor with PowerVR SGX540

Camera
3 MP Camera with Auto-Focus and LED Flash
1.3MP front camera for Video Telephony

Value-added Features
Android Market™ and Samsung Apps for more applications and contents
Readers Hub, Media Hub* , Music Hub*, Social Hub
*Availability will be decided by market preference.
Adobe Flash 10.1 player support
Full HD video playback, Thinkfree Office, Swype, Hybrid Widget

Connectivity
30 pin connector
WiFi 802.11n / Bluetooth® 3.0

Sensor
Gyroscope sensor, Geo-magnetic sensor, Accelerometer, Light sensor

Memory
16G / 32G internal memory with up to 32G external memory slot
RAM: 512 MB

http://www.eurodroid.com/2010/09/samsung-galaxy-tab-specs-images-revealed/