Here is news from SamFirware about the specs of the Galaxy S2 i9100 which has been leaked several times. We are pretty close to MWC 2011 and this might be the final specs of the device.
The phone will carry a 4.3inch or the 4.5inch Super Amoled Plus display as both versions were supposedly spotted in the wild. There is a 8 MP Camera on the back with a LED Flash and there is a 1.3 MP front facing camera.
The phone is powered by a Dual Core Orion Processor running at 1-1.2GHz and runs on Android 2.3 Gingerbread . It supports Bluetooth 3.0 and 32 GB microSD Cards. It also packs a NFC Chip like the Nexus S.