One of the major differences between the iPhone 6 and the iPhone 6 Plus is that the latter is capable of changing the Home screen's orientation. In other words, you can change from portrait to landscape mode on the Home screen when using the iPhone 6 Plus, just like the iPad. On the other hand, the iPhone 6 and older devices lack this capability, but if you've already jailbroken your iOS 8 device, you should definitely check out SBFlip.
SBFlip enables Home screen rotation on unsupported devices, just like the iPhone 6 Plus. This means that you can rotate your Home screen from portrait to landscape mode on iPhone 6, iPhone 5s and older devices running iOS 8. The tweak also comes with two flip styles called Dynamic Dock and Stationary Dock.