Microsoft just announced on the Power BI blog that the April update for Power Map is available for all Office 365 subscribers. This update adds the capability to add sound to any Power Map videos you export out of Power Map. They have also added some Geocoding updates that are detailed on the blog post as well.
The biggest change that is mentioned is that the Power Map Preview that has been available as a separate download for Excel 2013 will no longer expire on May 31, 2014! They plan to put out an updated version of this standalone add-in that will not expire in May. They are still recommending that this add-in not be used in production environment, but this does give you the capability to use Power Map without an Office 365 account in Excel 2013. Not sure what this means feature wise for Power Map Preview, my guess is that they will not keep it up-to-date, for that you will have to get an Office 365 subscription (highly recommended by me, as I have the Home subscription that allows for 5 desktop installs along with 5 tablet and the new iPad versions of Excel, Word and PowerPoint).