Is Windows Server 2012 & SQL 2014 supported?
I can confirm that Windows Server 2012 is supported because that is what I am currently running. I can not confirm on the SQL.
I will say this, Server 2012 seems to struggle running some of the older tools Solarwinds still provides you such as Report Builder and Atlas. These tools work about 60% of the time. I would recommend deploying of Windows 2008 if that is possible. I regret ever upgrading to Windows 2012.
Server 2012 is indeed presently supported. SQL Server 2014 is support is targeted for NPM 11 (presently in RC.)