Anywhere I can find a list of new language features/keywords from SQL Server 2008 to 2014?

I’m looking for a list of language features/keywords that have been added (i.e. FOR JSON, STRING_SPLIT, etc.) between 2008 and 2014 (not necessarily including 2008 though).

I’ve found numerous articles on what’s new in each version of SQL, but sadly none of them mention anything about this aspect.

In particular I’m wanting to know this information to, hopefully, persuade my boss to consider upgrading compatibility on a DB set at 2008 to 2014 (which is the version of SQL Server we’re using).