El Capitan - Arduino IDE serial port problems

So, even though there are success stories, a solution for the new MKR1000 ('Maker One?') for use in OS X El Capitan seems not at hand. I've tried the solution to disable the 'check for signed drivers' to no avail. Tried removing drivers, downloaded the hourly build, but no success.

Anyone here who got an Genuino (or Arduino for that matter) MKR1000 working under OS X 10.11.3 El Capitan?

Do we know what drivers (what chip brand) the MKR1000 needs? Are these signed?