I got the following reply today from Mazda.
Thank you for the enquiry through our Mazda Contact Us page. I note the request on information on a later map update for the MZD system.
I can confirm the latest release was launched on Monday 5 September. I apologise for the delay where we are bound by the mapping company to release dates and there had been a previous concern over the launch of the new Mazda Toolbox v4 release. This has all now been rectified and the new maps will be available for download.
I hope this helps in answering the question and if there is anything else I can do to help in the future, please feel free to reply to this email or call me on 03457 484848.