For OLTP, the most exciting new feature in SQL Server 2014 is In-Memory OLTP (aka "Hekaton"), which allows you to move individual tables to special in-memory structures. The performance boost can be as huge as 30x. There are a number of limitations and special requirements for these tables, so they won't work under every circumstance. But when they do, your OLTP performance will go through the roof. This is better than other in-memory solutions that require the entire database to be placed in memory. You can get more performance by converting existing stored procedures into in-memory procedures, too. You'll need to test to make sure your tables are compatible, but if they are, you'll love this feature.