What can we expect from Velious?

[BennoFlo]

As a preface, I started in the Luclin era on live, but I did spend a lot of time experiencing Velious content from quadding ulthorks to doing the shawl quests, but I didn't realize the mechanic changes involved with the expansion.

So, what type of changes occurred in Velious?
For example, iksars couldn't wear plate in Kunark, but in Velious, they can (maybe this is just because more items are available).

Were racial exp penalties removed? Were certain race/class restrictions changed? Were more skills added?

I don't know if there's a comprehensive list, but aside from zone, quest, and item content, I'm curious to what changes were implemented.

Thanks!