I think all but number 4 has been put out as intentional and number 4 might or might not be intentional.
- Mobs running faster than players
- As I stated before, Paineel going in before PoSky
- I don't think mob pathing is client based, and it has been changed from classic
- While it wouldn't have the same effect due to the new client, the spell book not required to be open in order to med. More than likely not like this due to the all but trivial effect it would have, but still omitted none the less.
- Rather than the caster having to do at least 50% of the damage to the mob in order to get full exp while soloing with a pet, the caster only needs to do 1 damage in order to get full exp.