I've recieved several requests about any limitations to the "5 user" version of TFS that is going to be included in each role based sku.  The questions basically boil down to "i hear there may be other feature differences, can you comment?".  The answer is there is no feature differentiation.  Nore is there any time limitation or period for the server.  The TFS server included is a fully functional version of TFS, limited to 5 user accounts.  There WILL be a Trial Edition of VSTS limited to 180 days, so perhaps that's where the confusion arises from, but the included version in the roles will not be time limited.