The next-generation iPhone is expected to ship with 2GB of RAM and could also have a pre-installed Apple SIM, according to AppleInsider. The iPhone 6s, and presumably the iPhone 6s Plus, would be adopting both features from the iPad Air 2, which also has 2GB of RAM and a pre-installed Apple SIM.
Though there is a lot of time for Apple to announce it's releases for the year 2015 but that doesn't stop the rising rumours about its next launches.
If the rumours come to life then the next Apple devices would mark the first bump in RAM capacity for Apple smartphones. The iPad Air 2 already comes with a 2GB RAM so this is what we expect to see on the iPhone 6S and the iPhone 6S Plus.
2GB of RAM would obviously enable smoother multitasking, but it might apparently take a toll on battery life in the process. Regardless, this feels like a common sense move so it's probably going to happen.
Apple might also consider shipping its next-generation handset with the Apple SIM pre-installed. That piece, which also made its debut with the iPad Air 2, allows consumers to sign up for mobile data plans from any participating carrier directly from the Settings app without long-term contracts and to switch providers at any time.
These rumors are rather predictable given that Apple typically improves the hardware specifications of iPhones and iPads each year, although the addition of a pre-installed Apple SIM on iPhone may still not materialize due to tough opposition from other carriers.