While talking with some of the Cowon reps at CES 2008 I was tipped off to the D3 while inquiring about supported video resolution on the D2. I asked if there were any plans the D2 would ever support video resolutions above 320×240. He said no, but the D3 might. The rep then gave me three pieces of information- the D3 will be smaller, slimmer, and out in 6 months. “Out in 6 months” is not very clear since this could mean out in Korea in 6 months or announced in 6 months. The US may see it 6 to 12 months in those terms.
Last year I was told that they had no plans to release the Q5 to the US and they did. There could have been a change of plans or there could have been a miscommunication in that it would not be Q5 in the US but a Q5W. That said I would take the D3 news rumor, but a very plausible rumor since it came from the mouths of Cowon.