Many are already proclaiming 2014 the year of VR for gaming technology with Oculus Rift leading the charge on this. Other products are now being developed which fit around the popular headset; two of which are the Omni and the Virtualizer. Both of these in fact address the same problem, that of moving in virtual reality and are, for all intents and purposes, omni-directional treadmills.
The Omni (seen above) is already available for pre-order and is a product of successful crowdfunding via Kickstarter. The Virtualizer on the other hand is demonstrated in the video below, in a demo which places the player in Skyrim with the help of both the aforementioned Rift but also two Wiimotes for interaction.
The potential of both of these devices, despite of course the practical issues associated with their size, is significant so it will be interesting to see how both of these are received.