www.microanvika.com here in the UK have been advertising a Vista R2H on there site for while now. I emailed them and got the following reply
"Dave,
The new model is expected to arrive here during the course of next week.
It will come with Vista installed, so hopefully the driver issues you refer to will have been addressed."
Look like Microanvika (who typically get Asus firsts and new deals before others) are due to receive Asus R2H’s from Asus with Vista preinstalled. This retailer is also showing the XP Table edition R2H as discontinued (it is not clear if this means the retailer is discontinuing it, or if Asus have discontinued it.
To me this means that Asus must have done some pre-testing with Vista, and thus identified the issues with certain things not working i.e. buttons and LED’s ceasing to function, and as a result I would assume they have already re-wrote the drivers and Asus build apps so they work with Vista. If this is the case I would expect to see driver for Vista on the Asus support site in the coming weeks