Several are designed to make him pack as more flat pieces (and thus be more shippable).
However, one of the critical lacks at Gallifrey when he was out conga-ing in the hallways was his inability to speak to the folks around him.
That has been fixed!
The voice modulator is not a perfect Dalek voice; I have plans for a better one. This is built using a hobby kit based on the WIN8072 IC, but had the advantage of coming with a pre-etched circuit board and all the necessary components for quick assembly.
TDK will debut with his new voice at Nova Albion this weekend (shhh)