We've had two prerelease versions on our teardown table, so we're excited to see what tweaks this Rift has in store. Here's the scoop so far:

Two OLED displays with a combined resolution of 2160 x 1200

90 Hz refresh rate

Accelerometer, gyroscope, and magnetometer

360-degree headset tracking via Constellation IR camera

Horizontal field of view greater than 100º