I don't really think that the post on HF is a hoax or an attention-getter or whatever, and the information is consistent with other comments made over time. Those Canuck Sennheiser people have been quoted before, iirc.
Anyway, I think I posted this info before, but Rhythmdevils met some Sennheiser folks at AES and had this to say about it:
"I was AES a couple weeks ago photographing for the daily that is produced for the event. There was a booth for Sennheiser, and Mr. Sennheiser was actually there! I didn't even know there was a mr. sennheiser.
So I asked his assistant about new headphone models, and she told me some very interesting things i thought you might be interested in!
They are working on some new electrostatic models. She couldn't tell me more than that because she said they were still in development stage.
She said also, that the HD800 would be coming out soon, i believe she said a few months. She siad it would have a completely new shell design, and a completely new driver. She was explaining that it would be more open air design like AKG- I'm not sure if she meant K1000 or K701."
The HD800 is coming out soon, I am certain of it. How soon is soon?, that is not known.