I see that 1607 is a recommended content so, you may just have your views looking for critical patches.
Cumulative Update for Windows 10 Version 1607 (KB3176934)
1511 I do see as Critical, so I would expect you to see that one as well.
Cumulative Update for Windows 10 Version 1511 (KB3176493) Critical
Both have the 64 bit version as well.
I'm referring to the feature updates themselves, not patches for the new versions. In other words, the patch/update that would take a 1511 version to 1607.
Windows 10 version 1607 is considered an operating system upgrade and not an update. PatchLink has never supported upgrades from Windows 7 to Windows 10 or from Windows 10 v-1511 to v-1607. Once you upgrade Windows 10 to version 1607, then PatchLink will keep version 1607 up-to-date.
If you are looking for a solution to help you plan, test, manage, and deploy Windows 10 v-1607, we have a Client Management solution that can help you with that. Operating System upgrades are best handled by a Client Management Tool and not a Patch Management Tool.
Hope this helps.
While the Win10 milestone upgrades are fairly significant, I'd argue that these updates are no more significant of a system change than a service pack like XP SP2. Not to mention that Windows Update is providing these system "upgrades".