Currently when pressing the + button to preview an upgrade to a skill, the UI updates the skill level but does not update the damage numbers and such for the next level. If I have two points to use, I can not see the effects of spending two points on a skill without actually applying the upgrade.
The UI should update when previewing a skill upgrade similar to how the character UI shows the effects of increasing stats before I apply the change. The skills UI should update to show the new damage/duration/etc of the new preview level as well as the level after, the change in SP cost of the new skill level, and the cooldown.