Traits and Slot Skills
The system changed pretty drastically.
Now, you purchase slot skills and traits with Hero Points. You get hero points at every odd level after level 10 (so at 11, 13, 15, ..) with increasing hero points at each interval as you go. Skill challenges were changed to hero challenges, and give one hero point on completion. Even without completing any skill challenges, you will have enough hero points to buy everything on a level 80 character. Your existing characters were retroactively granted the amount of hero points they should have, so yes you have to buy anything that happens to be missing. But since you’re level 80 it doesn’t matter, because you’ll have more than enough points to buy everything.
All the skill points you had before the patch were converted into a new currency called Spirit Shards. You use those to buy the same items skill points were used to buy before (stuff from Miyani). Spirit Shards drop from various sources and can drop randomly for level 80 characters.
The trait system is completely different. You now pick three trait lines, and then you pick a major trait at each tier within each line.
(edited by Tulki.1458)