No idea how much isolation...but I wouldn't expect anything IEM-like. These will be supraaural I suspect. In my mind I am thinking something akin to the Sony Streetstyles, though I can't cofirm that.
As for it not hitting in December, well, I think I wrote this in the write-up but if not, basically, John releases stuff when it's ready. It simply was not ready at the end of 2005, but I do know they are on their way to being released. As in, sooner than later. If March is what is predicted by John, (on the website?) then I suspect that will come true.
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