Well, if it does any good, I've found that on Device manager you can find a device (under HID devices section) called "Surface Type Cover 2 Firmware Update device", and on mine (fully updated via WU) it is 2.0.262.0 ..
According to the update history it should be 1.0.317.0 but I've downloaded the March driver pack and saw that it contains 2.0.262.0 too, with a release date of Jan 7, 2014. So no idea who's wrong.
I find the Type Cover 2's default trackpad settings to be a disaster -- no drag lock for a start. Hoping for an update firmware.
Yes, on my SP2 (4200), the March update changed the Intel video driver back to one that it made it unable to stream video from Hulu. I had to go back in and roll it back to the previous version to fix it.