The finish on the TH600 is likely temporary. If you look at the latest photos of it, you'll see places where paint is coming off. Fostex usually has black paint on their OEMs before they get put into production; the D5000 and D7000 are black in their catalogs, and the TH900 was originally finished in black before it got its lovely bordeaux coat. They could be going with a black finish, but it'll likely be a bit different or be in a different material.
The finish on the DX2000 seems more like a final product, given the lettering on the cups. It's not plastic, but either wood that is naturally black and given a matte finish or painted wood. Probably painted, as the DX700 and DX1000 are I believe.
I think the DX2000 may be a minor upgrade over the DX1000 for Chinese markets, similar to the DX700 --> DX800, though it seems a little odd they'd do away with the more reddish tint of the DX1000. Seems like cosmetic upgrades are getting popular again. Thinking of the Sony XBA-4 --> XBA-40.
Regarding those electrostatic headphones, I can't find any info on them. King Sound is indeed a speaker maker, but there's also a Kingsound (one word) headphone store in Hong Kong, so searches get confusing very quickly.
Could be a one-off or a DIY effort. It has a definite DIY stat look to it.
Edited by MuppetFace - 1/14/13 at 1:55am