The handset is powered by the same 1.5GHz dual-core processor as its predecessor. However, it's thinner, its RAM has been bumped up from 1GB to 2GB, onboard memory was increased from 32GB to 64GB, and it now comes with a microSD card slot.
Instead of being able to write and draw on one plane, you can scroll from side to side using a navigation tool in the bottom-right corner and take "panoramic notes" that are wider.