I'm surprised that Microsoft went with the name WM 6.0 as I thought Crossbow was sort of a intermediate upgrade. I saw a 6 minute video on Youtube the other day with someone demonstrating crossbow on their handheld device, the video itself dragged a bit, but interesting to see all the new features.
CNET has an article on Windows Mobile 6.0.
http://news.com.com/Microsoft+to+unv...l?tag=nefd.top
I'll speculate that while there might not me any upgrade on existing models, Dell will likely come out with some device based on either Windows Mobile Professional or Standard. At the same time, since WM6.0 is still based on CE 5, I don't see why an O/S upgrade is not possible.