If you are a Navision or Dynamics NAV customer Microsoft has changed the marketing name of your software.
The new name for Dynamics Nav or Navision is "Dynamics 365 Business Central".
Another change - apart form the name change - ss that Microsoft is positioning Business Central very much as a Cloud or SaaS platform. Whilst much of the marketing will emphasise its availability on the Microsoft Cloud. If you have your "Navision" software located on your won server, this is still supported. Perpetual licenses and on-premise configurations are still available.
The software always has strong integration with other Microsoft products. However you can expect this to get even better as Business Central develops under the wider Dynamics 365 family of Microsoft products including Dynamics CRM and Talent.