Hi,
According to this Macrumors's article "Nomura Securities also believes that Apple will include optical image stabilization (OIS) on both the 4.7-inch and 5.5-inch iPhone, whereas the feature has been exclusive to the larger iPhone 6 Plus and iPhone 6s Plus over the past two generations." link: Apple Turns to LG as Sony Falls Behind on Dual-Lens Camera ...
I do hope this is true as this is one of the features that I'd like to see when the 4.7 inch iPhone debuts this September.
Agreed. I would love to see Optical Image stabilization on the smaller iPhones. Fingers crossed.