The first SoC including Neural Engine was the A11 Bionic, used in iPhone 8, 8 Plus and iPhone X, introduced in 2017. Since then, every Apple A-series SoC has included a Neural Engine.
This change is strictly adding matmul acceleration into each GPU core where it is being used for LLMs.
I don't blame you. It's confusing.
2. It moves some stuff from the external Neural Engine to the GPU, which substantially increases speeds for those workloads. That itself is a feature.
Will any of this really matter much to the average consumer at this point? Probably not. Not until Apple Intelligence gets off the ground.