Mark Gurman, regarding the recent “hot pink” iPhone 5se rumors:

This weekend, reports have emerged with claims that the new device will be offered in a new “bright” or “hot” pink color option, but sources say that the iPhone 5se’s coloring is identical to the iPhone 6s’s in appearance.

Apple is said to be aiming to keep its hardware colors consistent across iOS devices.

Just based on anecdotal evidence — as in, the devices I see people using in public — it certainly seems like the rose gold option is incredibly popular.