iOS 9 contains a new QuickType feature that lets you slide two fingers on the iPad's screen to activate a trackpad-esque mode. Called "easy text selection", this feature lets iPad users control the cursor by sliding two fingers anywhere on the screen, including over the keyboard, to select, edit, and move text.
While easy text selection appeared in the initial iOS 9 beta for the iPhone, it was thereafter removed and has remained an iPad-only feature up until now. But, as has been highlighted by a user on Reddit, the easy text selection is making an iPhone comeback, as long as you own a new iPhone 6s.
That's because easy text selection has been rolled into the new 3D Touch suite for the iPhone 6s. Indeed, you'll be able to use the trackpad-like features on the iPhone, but only on the new iPhones.