Source: http://www.microsoft.com/licensing/products/products.aspx
Download the Microsoft Product Use Rights (WW, English, April 2015) document at http://www.microsoftvolumelicensing.com/userights/Downloader.aspx?DocumentId=8488

In short, prior to 1st of april 2015, you required

• a FIM server license for every FIM server installed and a CAL for every user managed in the FIM Service, or
• Forefront Identity Manager 2010 R2 External Connector

After 1st of april 2015:

• Windows Server license (Standard & Datacenter) will include FIM server entitlement
• FIM Server 2010 R2 licenses will not be available anymore on the price lists

The FIM server will no longer be sold as a separate license, but instead Windows Server licenses will allow customers to install the FIM Server software.
Azure Active Directory Premium (AADP) and any suite that contains AADP, including Enterprise Mobility Suite (EMS) and Enterprise Cloud Suite (ECS), will also entitle users to access FIM.
Since FIM users already required a Windows Server CAL or equivalent to access FIM running on Windows Server, no additional Windows Server CALs (or Windows Server External Connector) will be required.

More info here:

• #FIM2010 licensing model is changing as of 1st of april 2015
• http://aka.ms/LicenseToFIM

Thanks for the update, great info.

Wish I could just ignore things like this, but you have a typo:

"FIM Server 2010 R2 lices will not be available anymore on the price lists"

should read:

"FIM Server 2010 R2 licenses will not be available anymore on the price lists"