Lines are quoted from the official notes; buff/nerf tags are auto-classified from the numbers and can be wrong. Covers the 14 most recent Dota 2 patches PatchMeter has fetched.
▼nerfBase Movement Speed decreased from 315 to 310
▼nerfBase Attack Speed decreased from 110 to 100
⇄adjustSwitch DisciplineCooldown changed from 7.75s - 0.25s per level up to 8s - 0.25s per level
⇄adjustSwitch DisciplineNow the first katana hit or ability will deal 12% bonus damage after switching to Katana, and after switching to Sai Kez gains +12% movement speed for 2 seconds
✕removedSwitch DisciplineAghanim's Scepter no longer restarts the alternate ability cooldown if it was already on cooldown
⇄adjustGrappling ClawWhen targeting a tree, now always destroys the targeted tree and ends in the tree's position
▼nerfTalon TossCast Range decreased from 1200 to 650/750/850/950
⇄adjustShodo SaiThe proc effect now triggers a critical strike only instead of creating a Mark
✕removedShodo SaiNo longer restricts Kez from proccing passive Bash spells of Skull Basher and Abyssal Blade
▲buffShodo SaiMark Stun Duration increased from 0.4s to 0.5/0.6/0.7/0.8s
✕removedShodo SaiNo longer has a parry bonus by default
⇄adjustFlutter: Switch Discipline: The first hit bonus is now consumed by the first attack of Echo Slash and Raptor Dance, rather than applying to the entire cast
✓fixFlutter: Switch Discipline: Fixed the Katana bonus being lost if Echo Slash hit nothing
✓fixSwitch DisciplineFixed a bug with Aghanim's Scepter that would allow extra Sai abilities to skip cooldown
⇄adjustKazurai KatanaImpale damage changed from post-critical strike bonus damage to a separate instance of physical spell damage
▼nerfRaptor DanceMax Health as Damage decreased from 3% to 2.5%
✕removedRaptor DanceCan no longer be interrupted by casting Grappling Claw
⇄adjustFalcon RushNow has an 825 break distance
⇄adjustFalcon RushAttack Speed Factor rescaled from 6/8/10/12% to 9%
▼nerfShodo SaiMark Critical Strike decreased from 140/160/180/200% to 125/150/175/200%