We have seen something similar with the Apple iPad Air 2, which was launched with 2GB of RAM last year, up from the 1GB of RAM used on the Apple iPad Air. The additional short-term memory would improve multi-tasking capabilities, but could also consume some additional battery life.
The source also says that the Apple SIM card seen on the Wi-Fi + Cellular Apple iPad Air 2 will also be included out of the box on the new iPhone 6s models. With the pre-installed Apple SIM card, iPad Air 2 users can select a number of short term plans from AT&T, T-Mobile and Sprint in the U.S. and EE in the U.K. This allows users to select plans that better suit their short-term needs, especially when traveling. Without long term contracts to worry about, users can switch carriers more frequently.