We have pushed a reference marshmallow-dev branch and merged Marshmallow into AOSP master.
We also pushed the kernel updates. The following are the tags, projects, branches, and devices supported:
android-6.0.0_r0.1, kernel/msm, android-msm-flo-3.4-marshmallow, Nexus 7 (flo)
android-6.0.0_r0.2, kernel//x86_64, android-x86_64-fugu-3.10-marshmallow, Nexus Player
android-6.0.0_r0.3, kernel/tegra, android-tegra-flounder-3.10-marshmallow, Nexus 9 (volantis/volantisg)
android-6.0.0_r0.4, kernel/msm, android-msm-hammerhead-3.4-marshmallow, Nexus 5
android-6.0.0_r0.5, kernel/msm, android-msm-shamu-3.10-marshmallow, Nexus 6
android-6.0.0_r0.6, kernel/mediatek, android-mediatek-sprout-3.10-marshmallow, Sprout
bill