Microsoft will not be shipping these until Winter 2007, so you will have to wait a while for one. Plus, the price will be WAY too much IMHO.
In addition, it looks like these are geared towards a surface mount application (hence the name surface), not a wall mount, which would more effective for HA. With all of the data exchange capablilites when you place a smart device ON the surface screen, this would be lost with a wall mount application.