The customary final service pack for SQL Server 2012 is just a round the corner before the product exits mainstream support in July and is sealed to all but security and critical bug fixes.
Yep no edition of SQL Server has ever had a Service Pack 5 :)
What are the key things SQL Server 2012 will be remembered for? Possibly:
- introduced AlwaysOn Availability Groups
- introduced Columnstore indexes
- the infamous transition to core based licensing
- introduced the short lived Business Intelligence edition
- introduced (partial) contained databases
- introduced LocalDB
- BIDS replaced with SSDT