Though we have always assumed Samsung will provide Android Marshmallow updates for all Galaxy A (2016) devices, there was no concrete evidence pointing in that direction. Now, certifications provide just that. Over at the Wi-Fi Alliance, Samsung had several regional versions of the Galaxy A5 (2016) and Galaxy A7 (2016) certified running Android 6.0 Marshmallow, giving us a first glimpse of the existence of the upcoming update.
Other than the certification for the 2016 generation of the A5 and A7, no other Galaxy A devices have been spotted running Android Marshmallow so far. However, we do expect to see the A3 (2016) and A9 in the waiting line soon as well. As far as predictions about the actual rollout of the Marshmallow update for the Galaxy A (2016) devices are concerned, we can't provide you with any concrete date. Sometimes, updates start weeks after renewed Wi-Fi certifications are published, but knowing Samsung it could easily take longer than that. Still, at least we now have concrete proof that the update coming.