Yay or nay? Something I wish they will include but I doubt they will until the S model or even the iPhone 7. More and more Android phones being released this year are coming with 4K recording. Pretty much all the flagship Samsung phones and the new Moto X. If Apple sticks with their 8MP sensor we won't see 4K. But if they go slightly higher at 10 or 12MP it's possible they could include it. Possibly even turn it on with an iOS update in the future. Before anyone says "but most people don't even have 4K TVs." Remember that downsampled 4K makes for better HD footage. Plus all of Apple's Retina laptops and iPads are more than HD.