It was indeed clear that Google had something new in terms of Gmail up its sleeve since some leaked screenshots from Google io 2013 suggested it.This news comes a bit more broad then an expected one. Google today announced a redesign in the Gmail experience with categorization based on it’s intelligent learning engine.
Google introduces a new way to do inboxes by splitting it up into multiple categories that group them by type: one for social networking, one for promotional correspondence from businesses, and one for news about app updates, as well as keeping track of invoices and receipts.
When it comes to availabilty , Google says it would be rolling out to Desktop, Android and iOS over the coming weeks so keep an eye out for it.
Source : Android Police