I hadn't seen this news on the forum before. Edmund's reports that the 370Z convertible will be debuted at the 2009 NY Auto Show (April 10-19).
2009 New York Auto Show: World Debut of 2010 Nissan 370Z Convertible Confirmed | Straightline Blog on Edmunds' Inside Line
I love the looks of the 370z coupe, but the primary competition for it (for my personal purchasing decision) is a 2-4 year old Boxster S. The hard top coupe is a tough sell for my wife who thinks sports cars should be "fun" and "fun=convertible" for her. I have only seen a few pics of the supposed 370z convertible and so far it is not nearly as impressive as the coupe. I need more angles and I need to see the top up before I could have a real opinion though.