New version of Exchange server named as Exchange 2013 Server. The preview version is available to download from below link.
Few of the new features
1. Only two server roles ( Mailbox role and Client Access role)
2. No Exchange Management Cosole ( EMC), instead of new web admin console called Exchange Administration center.
3. Required Windows 2008 Server R2 SP1 or Windows 2012 server edition to install new Exchagne server
For more reading check the below link