Here is the full changelogs of May 2016 Android 6.0.1 Marshmallow update. It's Monthly Android Marshmallow security update for Android users. Here is the full list of Android marshmallow compatible devices.
Now let's move to Changelogs, I have made a changelogs of this update from code commits of latest Android 6.0.1 update. This update is only includes the MOB30G-MOB30J builds.
This months changelogs are bit brief, basic is just as last update security related bug fixes. Here is the full changelogs of May 2016 Android Update.
Here is everything about may security update. AOSP posted everything regarding the same. You can find the all change logs at below.
Added May 3rd
MOB30G - android-6.0.1_r30 –> android-6.0.1_r40 (Nexus Player, Nexus 9 Wi-Fi & LTE)
MOB30H - android-6.0.1_r40 –> android-6.0.1_r41 (Nexus 5)
MOB30I - android-6.0.1_r41 –> android-6.0.1_r42 (Nexus 6)
MOB30J - android-6.0.1_r42 –> android-6.0.1_r43 (Nexus 7 2013 Wi-Fi & Mobile)
Added May 5th
MTC19T - android-6.0.1_r22 –> android-6.0.1_r25 (Nexus 6P and 5X)
MXC89F - android-6.0.1_r18 –> android-6.0.1_r32 (Pixel C)
Added May 11th
MMB30G - android-6.0.1_r20 –> android-6.0.1_r26 (Nexus 6)
MMB30H - android-6.0.1_r26 –> android-6.0.1_r27 (Nexus 7 2013 Mobile)