I've just spoke to Astoria Honda in Bentleigh and they have told me is that they are now awaiting for V17 to be released, and the cost of that is around $500.
But there is nothing else mentioned in their websites. I think I might put my order in and wait. If anyone is interested in splitting the costs please PM me. I have the 2008 Honda Legend, and apparently all of the current model Accord Euro Lux Sat Nav uses the same system.