The Enterprise version fo Dynamics 365 includes a number of modules that were parts of Microsoft's CRM and ERP products previously, plus a new Marketing service (Adobe Marketing Cloud). It doesn't seem Marketing Cloud is yet purchasable by customers. The Business version fo Dynamics 365 so far only includes the Financials Module. Sales and marketing modules for that version are coming in 2017.
Cortana integration with sales, accounts, deal information and meeting prep is listed as a "preview available" feature for Dynamics 365 for Sales, Customer Service, Field Service and Project Service Automation. Azure Machine Learning is listed as a "preview available" feature, as well.