Yes, Moto web site video on how to use the dock says the X2 is backward compatable, so I assume the X doc is the same, they have not even updated the accessories page, when you click it for X2 it takes you to the X dock.
Yeah, I asked Motorola and they told me the same thing..... If I had done just a little more poking around on the website, I could have figured it out on my own.