FOX Racing Shox was showing off their prototype mechanical dropper seatpost. They are calling it the “Drop On Steep Sh!t” (D.O.S.S). Slated for their 2012 product year, the seat post will be available in 30.9 and 31.6 sizes. The seat post offers 3 positions of adjustability and is available in a 4″ and a 5″ version. Check the video out inside to learn more.
2012 FOX Prototype Dropper Seat Post D.O.S.S.
The height adjust lever is made by Shimano. The design may not look exactly like this for the finished product but they are planning on having it made by Shimano.
FOX certainly has previous experience at keeping dirt out of internals due to their experience with fork seals.