Microsoft released a firwmare update for the Surface dock on 4/19/2016.
The dock works much better now with DP devices (some were not working for me before).
It also supposedly works now with passive video adapters (I don’t have any to test).
But the situation with CAC-1170 is unchanged. The firmware on my CAC-1170 is 0x07 0x23, not sure if it’s the latest.