I have seen, held and tried it yesterday, it is a cool little GPS unit! It is very light and thin, fits into a shirt pocket easily.
The display is rather small but it is high resolution so you can see more detailed info on it than on a GPS V. The buttons are quite small too, so glove control might be a bit of an issue.
It comes with the Garmin car cradle, and if I wanted to buy one (I don't, as I have a 2610) I would mount it on the bike with that for sure. With some creativity you can mount a RAM ball on the back of the car cradle and you're all set. It might not be the ideal and most secure mount, but it can keep you going until RAM or Garmin comes up with the real thing. The unit slides into the mount from the top and it won't pop out for sure.
So I wouldn't let the bike mount problem stop me if I wanted one. It comes with 256Mb, so you can fit quite a bit of maps on it. And the supplied car cable has a built in speaker. If you cut off the plug and speaker end, you can use it for hard wiring it to the battery and connect helmet speakers or earphones to the sound wires. I did that with my 2610 too, no problemo.
The antenna clicks into 3 postions quite securely, so I don't think that will be a problem either.
The built in rechargeable battery is a nice feature too. You can use it for hiking or or city tripping all day if it's fully charged. And it has a 10.000 points tracklog with TracBack feature.
I think this is gonna be a hit!
Cheers,
Michel