Nightslayer Chest:
Old: AC: 200, Agi: 29, Str: 10, Spirit: 7, Sta: 14, Fire: 10, Frost: 10, Arcane: 12
New: AC: 200, 10 Strength, 29 agi, 20 Sta, 10 FR, +1% to crit
Nightslayer Shoulders:
150 Armor +3 stength, +26 agi +12 sta +7 Shadow +1% hit
Nightslayer Cover:
163 Armor +6 str, +20 agi +19 sta +10 Fr
Nightslayer Belt:
113 Armor +9 strength +17 agi +18 sta +7 fr +1% Crit
Nightslayer Gloves:
125 Armor 12 Strength 18 agi, 17 sta 7 fr 1% to hit
Nightslayer Braclets:
88 armor 20 agi 15 sta
Nightslayer Boots:
138 Armor 26 Agi 18 Sta 7 Shadow
Nightslayer Pants:
175 Armor 10 str 33 agi, 15 sta 10 shwdow 1% to crit
----------------------------------------------------------------
Total changes:
0 AC
+18 Agi
-8 Strength
-44 Spirit (finally!)
+37 Stamina
+2 Fire Resist
-30 Frost
-24 Nature
-39 Arcane
-5 Shadow
+3% Crit
-1% Dodge
+1% to hit
In all, I would say definitly some good changes. The move from spirit to staminia is probably welcome by everyone. They seemed to have removed all the resists except for shadow and fire. Why they did this? They've said they want future instances to not require resist gear -- so perhaps just a move on their part to make the gear better for non-magical pve/pvp (while keeping it useful for the currently inplimented and planned encounters -- MC/Onyxia/BWL).
The belt for example used to have 14 FR, 10 Arcane 10 Shadow, and now just has 7 fire, but gained 7 stamina and 1% to crit.
Oh well! it looks much better too imo.
--------
Not sure about set bonuses? The bonus for 3 and 5 did not change.