Twitter says in a blog post that it checks for account origin and behavior and once enabled, removes low-quality content such as duplicate tweets or automated content from your notifications.
Apart from that, another addition is the option to get notifications only from people you follow on twitter. This is a good step towards limiting so much noise from not-so-important tweets and updates.
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Unfortunately, this update is currently available for iOS users only but will start rolling out on android device in few days time.