Microsoft Dynamics NAV 2015 was released a couple of weeks ago. I have download and installed it and so far it seems like it can co-exist with Dynamics NAV 2013 R2 without any issues (which was not the case with my 2013 and 2013 R2 versions, so this is great).
To me the improvements that the users will see (e.g. the functionality in the NAV clients) are the most important ones (and also the most fun to review). The improvements of the technology behind the scenes (such as OAuth support for web services, merge utilities, multi-tenant architecture, etc.) are also important but of less interest to me as a business consultant. Therefor I will simply ignore those in this post.