Thanks for the advice. I actually started looking for this information on MotoringFile but the process is kind of tedious. There are hundreds of posts related to RXX models so looking through all of them will prove very time consuming. In addition the search function on the site isn't very flexible.
So the date wasn't there, but searching "buyers guide" led me to another post where the availability date of the R56 was indicated. February 2007. Thanks for your help!
