The following patches have just been released and all have an associated security update so they may have already been applied. The security update appears to be due to Dimension security being ignored by Power BI Desktop in SQL Server Analysis Services (Multidimensional model).
Mainstream support has now ended for SQL Server 2012.
In an unusual turn of events Microsoft has advised that the final SP4 is expected to be released in September.
Currently, any new installs of SQL Server should be 2016 to which allows non-Enterprise editions to take advantage of some Enterprise features which were introduced in SP1. Software Assurance is also a growing ‘must have’ to allow for DR, use of ever increasing new SQL releases etc.
SQL Server 2017 is due for release, but unless you want the pain of bugs for several months, it will likely not be worth considering until later next year when it should be more stable.