This is a great extract from the recent Microsoft Online Services Terms which gives an overview of the suites available and products contained.
Per-User Microsoft Office Licensing
Office 365 ProPlus (Word, PowerPoint, Excel, Outlook, OneNote, Publisher, Access, and Lync)
Office 365 ProPlus is a per user subscription based license.
Each Office 365 ProPlus User Subscription License must be assigned to a named user.
Please note that this is different from the usual Office Pro installed on Fat clients. This is a device based license and is licensing the machine itself!
Additional rights are granted for up to 5 machines for the software to be installed on as well as over a network. IE remote services Virtualising and RDS
Office 365 ProPlus include rights providing access to Office for licensed users, which are not supported by click-to-run deployment. Under those use rights the Licensed User may install one of five permitted copies of the software on a network server with RDS.
As always if you require any assistance in licensing please feel free to contact me.