The notes haven't been updated yet, but heres some info based on what could be gathered from blue feedback. I will keep the thread updated with more info as it comes in today.
- EM/NS change has been reverted.
-- Hortus - The patch notes have not been updated with this change yet.]
- Flametongue now has 5 sec Mortal Strike Debuff that refreshes every hit.
- Toughness: 5/5 = 50% duration reduction on movement impairing effects.
- Flametongue Totem damage effects now also reduce healing done to the target by 50% and lasts 5 seconds.
- Mind Vision is being changed to no longer work in the arenas next patch.
-- Nethaera - Mind Vision will not currently work in Arenas with patch 2.4.0.