With SQL Server 2012 RTM being available and the becoming officially available on April 1 (Will have to wait and see if it a trick or not), To help you identify which edition you need to use based on the feature set you require or would like to use a full list of Features Supported by Editions is available for reference.
If you are planning some new implementations or upgrades to SQL Server 2012 then this will be a good start for you to find out what features you could possibly be using and which edition you need to utilise those features.
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