There are actually a few differences between the Tab 10.1 and Tab 2 10.1:
1. Processor: Although they both offer a dual-core 1 GHz cpu, the Tab 2 will offer an udated TI OMAP version
2. Camera: The Tab 10.1 will offer a 2mp front facing camera, while the Tab 2 10.1 offers a VGA front facing camera
3. SD Card: The Tab 2 10.1 will offer an microSD card reader that will support up to 32GB of storage, while the Tab 10.1 requires a separate dongle for SD card reading
4. IR Blaster: With the included IR Blaster, the Tab 2 10.1 can be used as a universal remote, helping you easily find your favorite shows. The Tab 10.1 will not offer this feature.