Motorola Moto X Style seems to be the first smartphone to receive Android Marshmallow update, so soon. According to David Schuster’s post on Google Plus, Motorola has started rolling out the update for Moto X Style in India and Brazil as of now. He also added saying
Full deployment will proceed in stages over the next few weeks. It is not yet available for pull, you will receive a notification on your phone when you are able to update your phone
The Android Marshmallow update brings a whole set of new features to Moto X Style that includes Google Now on Tap, new Memory Manager, Do not disturb button, System UI Tuner, RAM manager, Automatic App backup and lots more. You can check the complete change log here.