Proper details are thin on the ground however a summary would be this.
- Optimised battery sizes due to the Exynos 2200 chipset
- AMD mRDNA 2 GPU onboard SoC along with 5G
- Ultra means Note and Plus means Pro in terms of marketting.
- The benefits from the better GPU will give the current GPu's a run for their money even the Apple A15 Bionic (speculation).
- From a normal users point of view, it would appear Samsung is trying to create a parity in the market they are aiming devices at.
Obviously this is all speculation and will be confirmed or proven differently at the product release.
Samsung Galaxy S10, Samsung Galaxy S21 Ultra