The official date of Flyme 6 is not yet announced but recently one of the company officials gave the news that it would be before the Chinese new year which is on 28 January... There is no other news on this but since the Meizu M2 is less than 2 years old device and since Flyme's system general manager Pony had said in an interview that most devices would skip the marshmallow update and directly be updated to Android Nougat so I expect that the M2 might also get the Flyme 6 update... But this is just as per my knowledge and nothing has been officially confirmed yet by Meizu...