AnentI saw a comment from Will that there were a few production models sitting around the office that Massdrop was open to giving to reviewers. I've had my hat out of the audiophile ring.... (and general reviews for that matter)... to probably qualify for a production sample look-in; but I can make a few guesses on the pictures we do have available.
Only one picture :: https://massdrop-s3.imgix.net/product-images/massdrop-x-hifiman-he4xx-planar-magnetic-headphones/AI7B9909_copy_20170725104736.jpg :: gives us an inside shot of the internal wiring. However; the other pictures don't match up to some of the description given in the promotional bump. E.g.; Either my monitor's color calibration is off; or the headphone on display is one of the production prototypes as it lacks a mentioned midnight blue color.
Assuming that this is a production prototype on display instead of a finalized model; I'm not sure we can definitively say that there are no shielding solutions or chokes in use. What we can assume is that the internal construction will very likely that match that of other HE-400 devices. A quick check of Head-Fi isn't showing me any obvious threads over internal shielding issues muddling sound on other HE-400 devices.