A first look at the upcoming Exchange version (Exchange 2016) will be available at Microsoft Ignite. At the Exchange Team Blog, some information about Exchange 2016 is already available. The release of Exchange 2016 is planned for the second half of this year. The Ignite Session for Exchange 2016 is expected to be available online from May 7.
Here is the information that has already been published on the Exchange Team Blog for Exchange 2016:
- A new approach to document collaboration that makes it easy to send links and collaborate without versioning issues of attachments
- Faster and more intelligent search, to help users quickly find what they need in their mailboxes and calendars
- Significant improvements to eDiscovery search performance and reliability
- Better extensibility, including new REST-based APIs for Mail, Calendar, and Contacts that simplify web and mobile development
More and more information is likely to be released in the coming weeks, so wait and see 
