Huawei confirmed Android 6.0 Marshmallow for these Chinese models of these smartphones:
Huawei P8, Huawei Mate 7, Huawei Mate S, Huawei P8 Youth Edition, Huawei P8 Max, Huawei G8 Chinese Variant, Huawei G7 Plus, Huawei G7, Huawei Honor 7, Huawei Honor 7i, Huawei Honor 6 Plus, Huawei Honor 6, Huawei X2, Huawei 4X, and Huawei Play 4C.
There might be many similarities between the Chinese and international list of devices to receive Android 6.0 Marshmallow, but we're still waiting for official word from Huawei.
It's also worth mentioning Huawei did not unveil any details on what is going to happen with their Emotion UI once these Android 6.0 Marshmallow updates start rolling out.
A new version of Emotion UI hasn't been confirmed yet.