Twitter mobile app users can now embed a tweet inside another tweet. Both Apple and Android users can enjoy this new feature.
In order to embed a tweet in a tweet, Twitter mobile app users simply have to drop the previous URL link in the new tweet they are composing. When the tweet will be shown, the whole linked tweet will be visible instead of just a URL link.
Twitter could be trying to redesign retweets with this new feature. This new embed tweet inside tweet feature will give users option to show their full 140-character opinion in any tweet instead of manually doing retweet using RT.
However, this new feature is not available for Twitter's Web app user.