While I had written in the past about the components in Surface 2 and Surface Pro 2, we now have a much more complete understanding of what's included with each device. Here's a more up to date account of what you can expect to get inside each Surface 2 and Surface Pro 2.
Surface 2
CPU: 1.7 GHz quad core NVIDIA TEGRA 4 (T40)
Graphics: Integrated
RAM: 2 GB
Internal storage: 32 GB or 64 GB
Display: 10.6-inch ClearType Full HD (1920 x 1080) display with five-point multi-touch
Wi-Fi: 802.11 a/b/g/n
Bluetooth: 4.0 low energy technology
Battery: Up to 12 hours claimed (10 hours of video playback)
Front camera: 3.5 megapixel LifeCam with 1080p video capture
Rear camera: 5 megapixel LifeCam with 1080p video capture
Speakers: Dual, stereo
Microphones: 2, with noise cancellation
Ports: Full-size USB 3.0, microSDXC card reader, headset jack, HD video out port, cover port
Sensors: Ambient light sensor, accelerometer, gyroscope and magnetometer
Size: 10.81 inches x 6.79 inches x 0.35 inches
Weight: Less than 1.49 pounds
Exterior: VaporMg Magnesium casing (in natural silver)
Hardware buttons: Power, Windows, Volume Up, Volume Down
Surface Pro 2
CPU: 1.6 GHz 4th generation Intel Core i5-4200U with Turbo Boost up to 2.6 GHz
Graphics: Integrated Intel HD Graphics 4400
RAM: 4 GB or 8 GB depending on model
Internal storage: 64 GB, 128 GB, 256 GB or 512 GB depending on model
Display: 10.6-inch ClearType Full HD (1920 x 1080) display with 10-point multi-touch and 1,024 levels of pressure sensitivity for digital pen
Wi-Fi: 802.11 a/b/g/n
Bluetooth: 4.0 low energy technology
Battery: Up to 7 hours of video playback claimed
Front camera: 720p LifeCam HD
Rear camera: 720p LifeCam HD
Speakers: Dual, stereo with enhanced signal processing
Microphones: 1
Ports: Full-size USB 3.0, microSDXC card reader, headset jack, mini DisplayPort 1.2, cover port
Sensors: Ambient light sensor, accelerometer, gyroscope and magnetometer
Size: 10.81 inches x 6.81 inches x 0.53 inches
Weight: 2 pounds
Exterior: VaporMg Magnesium casing (in dark titanium color)
Hardware buttons: Power, Windows, Volume Up, Volume Down
Pen: Includes Pro Pen