Samsung has finally announced Samsung Galaxy S III in London.Samsung Galaxy S III is larger and thinner than Galaxy S II.
Samsung Galaxy S III specifications
Dimensions 136.6 x 70.6 x 8.6mm
8 MP primary and 1.9 mp front-facing camera
16 or 32GB of storage with 64GB storage will be included later

Quad core 1.4GHz Exynos 4 Quad processor
Android 4.0 Ice Cream Sandwich OS
Super AMOLED TouchScreen Display of 4.8-inch
Li-Ion Battery of 2100 mAh
Corning Gorilla Glass Protection with TouchWiz UI v4.0
Bluetooth 4.0 support
GPS with GLONASS reception
NFC
SupportS 2G (GSM), 3G (HSDPA) and 4G (LTE) Network
Commercial of Samsung Galaxy S III
Galaxy S III will be released in Europe on May 29, 2012 and 4G LTE 4G versions will be released in North America and Japan in summer whereas in US in June.
Price of Galaxy S III is yet to be announced.