Kinect 2 looks promising, but there're no dramatic improvements. To summarize:

• Approximately the same working distance (up to 5m)
• Slightly larger capture area thanks to a wider FOV
• Better resolution and accuracy of depth measurements - thus, improved tracking accuracy
• Less overall noise, though there is some noise at the corners of the image
• No noticeable mutual interference when using multiple sensors

New Kinect SDK allows to track up to 6 actors (for a reliable tracking, they all should primarily face the sensor). This may be useful in some other applications. However, we do not use the skeletal tracking provided by Kinect SDK, so there is still 2 actors limit in our software.