The actual latest version's download page now appears to be 16.2.1, released yesterday:
http://support.amd.com/en-us/kb-articles/Pages/AMD_Radeon_Software_Crimson_Edition_16.2.1.aspxFor some reason, via the usual links on AMD.com only shows 15.12 as the latest, until you notice the web-based installer and release note links to the download.
Judging from the filename (which starts with “Non-WHQL”), I would assume that the other ones haven't been updated yet as it hasn't been WHQL tested yet.