Tweet from Motorola tells us that the Motorola Moto X wood backs are still not ready
This doesn't mean that you can't still customize your own Motorola Moto X right now, it only means that you will have to use a regular back instead of a wood one. Late in November, Reuters writer Sinead Carew tweeted that the wood backs would be coming in time for the holiday shopping season. Considering that Christmas is but ten days away, time is slipping away from Motorola if it wants to offer the wood backs for this year's holiday season. We would think that outside of some true believers, those that wanted a teak, ebony, rosewood or bamboo backed Moto X have already selected a different back for their Moto X, or a different phone.
source: @Motorola via AndroidCentral