Twitter's mobile app for iPhone and iPad has gained updated profile design on mobile with a new Tweets & Replies tab now gradually rolling out to users. As first noted by 9to5Mac, the profile section shown upon tapping Me at the bottom of the app now resembles Twitter's web interface, which also separates replies into a dedicated tab. Previously, Twitter for iOS consolidated both your own tweets and replies under a single Tweets tab.
This tweaked profile design on mobile is a staggered rollout so check back in a few days if it's currently unavailable to you.