Does nobody search anymore???
Okay here's a bit of food for thought. Skyrim was not 100% created by the developers.

Shock! It is composed of many many different aspects created by different companies. It is likely that they bought the software and code to handle the lip syncing, for instance.
They have to strip that particular code, ie for lip syncing, from the CK because it isn't open source, and wasn't created by bethesda.