Microsoft released a new poster with avaiable platform options fo Exchange Server 2013.
For BDMs and architects, this model describes the available platform options for Exchange 2013. Customers can choose from Exchange Online with Office 365, Hybrid Exchange, Exchange Server on-premises and Hosted Exchange. The poster includes details of each architectural option, including the most ideal scenarios for each, the license requirements and IT Pro responsibilities.
Download if from here: http://www.microsoft.com/en-us/download/details.aspx?id=42676