SSDs and 64K sectors
Yes, 64KB is still the current recommendation as it has to do with partition alignment.  To quote Jimmy May from the the SQL CAT team:


  Partition alignment remains a best practice for all versions of
  Windows Server as well as SQL Server, including SQL Server 2012 &amp; SQL
  Server 2014.  No exceptions.  Period.


As part of the Best Practice guide referenced in that article, the following line is quite explicit:


  The file allocation unit size (cluster size) recommended for SQL
  Server is 64 KB


As for a SSD vendor's perspective, I point you to Argenis Fernandez's blog post about this very topic.  Pure even recommends 64KB for NTFS block size, so I think it's safe to assume this is a pretty universal truth.