Today (May 10, 2016) FileMaker Inc released FileMaker 15. My review of FileMaker 15 will be online at Macworld.com shortly, and it's a positive review. Nevertheless, even if you've got a licensing contract with FileMaker that enables you to upgrade "for free," I recommend that you hold off on upgrading for the time being.
FileMaker has modified the way that FileMaker Server 15 is licensed, and the changes are going to have a big impact on the nature and the cost of third-party hosting services like FileMaker Hosting Pros and Point in Space, which are used by so many of our clients. Some aspects of how this is going to affect my clients and licensees remain unclear. So,
We'll have more info soon and will let you now. Come back here in a week or feel free to contact us directly if you have a question.