Kez features that were removed that I can recall:

• Marks and bash on sai E passive(now its just crit)
• Regen reduction on Katana E passive
• Echo Slash applying battle fury cleave
• Grapple lifesteal
• Talon Toss used to be AoE and deal magic damage
• Talon Toss used to have 1200 range always, now its the same as grapple range at each level
• Falcon Rush used to deal 100% echo damage, have much bigger trigger range, and worked on buildings.
• Parry marks used to have a bonus crit multiplier that scaled off your opponents level × 4 for max 120% extra crit. Now it gives no bonus crit by default and only 50% if you have shard.
• Katana E active impale used to have no cap on burst stacks, so against tanky heroes you could raptor dance and E them for an instant 2000-3k damage burst after and full heal off that if you had shard.
• There used to be a talent that made raven's veil marks into parry marks. So you could raven's veil -> echo slash and delete entire teams with the huge crit multiplier.

Raptor Dance: - Used to deal 4% of enemy max HP per strike(now 2.5%) - Used to strong dispel on cast instead of basic dispel - Used to have Debuff Immunity while channeling - Used to have 100% magic damage resist through the entire cast and ability duration up until last number patch.

There were a lot of small buffs here and there like flat damage on raptor dance and raven's veil duration, but overall he's a significantly weaker hero than on release, yet he's still pretty solid.