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The following new scenarios were added to Exchange Server 2013 Deployment Assistant
- Upgrading from Exchange 2007 to Exchange 2013
- Upgrading from Exchange 2010 to Exchange 2013
- Configuring an Exchange 2013-based hybrid deployment for Exchange 2007 organizations
These new scenarios provide step-by-step guidance about how to upgrade your existing Exchange 2007 or Exchange 2010 organizations to benefit from the improvements and new features of Exchange 2013.
Exchange 2007 organizations can now configure a hybrid deployment with Office 365 using Exchange 2013 instead of 2010 SP3 in their on-premises organization.
Exchange Team also is working on additional scenarios, such as upgrading from a mixed Exchange Server 2007/2010 organization to Exchange 2013 and configuring Exchange 2013-based hybrid for Exchange 2010 organizations.
More informations you can find here