Just to add a bit more:
- Fostex has continued to release/refine the 443742 family through a variety of sources - their own TH-6/9xx line, as well as Massdrop releases, the E-MU (Creative) full-size woodies, and so forth.
- Massdrop in general, who have done a lot of cost-down'd releases of "former flagships" like AH-D5000 (TH-X00), HD 650 (HD 6XX), K701 (K7XX), etc. They also have done collaborations with some equipment makers, like TEAC, Grace, etc (just saw Cavalli Audio on the front page today too).
- Ultrasone has gone back to their "old style" full-size closed cans, re-releasing the Edition 7 as Tribute 7, and offering up the Edition 9 (as Signature Pro) and some variations thereof (as Signature DJ and Signature Studio).
- Audio-Technica has, as pointed out, not done anything really "big" in a year or two - they recently revised all of their headphones with a "Z" variant (including W1000Z), but no 55th anniversary release appears to be on the horizon to follow the ATH-W3000ANV.
- Sennheiser released a new Orpheus-level product, and set a new upper limit for price well into the realm of "hilarious." I've heard talk of a HiFiMan offering that's supposed to get into that mad money category too (we're talking >$50,000/pair here, if you were wondering).
- Grado has released two new full-size open cans - the GS-2000 and PS-2000 - as up-models from what they had previously. Some reviewers seem to really like the PS-2000, but the price (as seems to be the trend) treads into new territory (somewhere around $3000 US from what I've heard). I think GS-2000 is supposed to cost around what the GS-1000 do (did?) though. Haven't heard much of anything about those though.
- Technics "came back" and re-released the SL-1200 (which sold out pretty quickly in the initial run from what I've read), some hilariously expensive amplifiers (which are a faint shadow of their former flagship gear), and a pair of two-way headphones that've gotten pretty polarizing reviews (but hey, they *are* a new/unique design in a world of otherwise stale offerings).
- Denon, apparently realizing that their decision to completely abandon Fostex and "go their own way" was actually a bad idea, have gone back to Fostex-based headphones, and released a new flagship model called AH-D7200 that bears striking resemblance to the 443742 family (and it doesn't cost a million dollars either), but as was pointed out: it doesn't seem to get talked about much. I have no idea if they have attempted to "bring back" the AH-D2000, but I'm sure the community would appreciate it.
- Bowers & Wilkins threw their hat into the circle with the P9; I haven't heard much about them since they were first launched though. They look pretty though.
- Shure released a few high end dynamic cans (SRH-1840 and SRH-1540), as well as (even more recently) an electrostatic in-ear (KSE1500).
- Klipsch is apparently going to take a whack at headphones again (and apparently this time, they mean it).
- STAX apparently has some new headphones coming in the not so far away future, but off hand I don't recall their model designations. There was a thread in Summit-Fi a while back about it.
- Apple bought Beats, and has been pushing for more wireless devices to integrate with the iPhone (which now doesn't feature a headphone jack).
- Sony introduced the Pentaconn connector and has been making noise about balanced headphones for mobile/desktop use. I don't know that anyone is listening though.
- MQA happened (what is MQA?
https://en.wikipedia.org/wiki/Master_Quality_Authenticated - the blunt/cynical answer is: Meridian's attempt to become relevant again by bogarting the "hi rez download" industry and making it all proprietary/DRM'd in a way that sees us paying them for existing)