http://www.playdota.com/changelogs/6.73
big changes all over the place. Most interesting (besides the new heroes) imo:
- couriers give a bigger gold bounty, but respawn and no longer drop items when killed; also no invulnerability shield on flying courier anymore
- Heroes respawn with full mana
- Gold over time from 0.875 intervals to 0.8
- Reincarnation cooldown decreased from 300/220/140 to 260/160/60
- Orchid Malevolence now requires 2 Oblivion Staffs and a 775 gold recipe, and loses 15 damage/75% mana regen in exchange for 5 intelligence and being 900 gold cheaper overall
- New item Abyssal Blade requires a Sacred Relic and a Basher, gives 100 damage / 10 str / a castable, 2 second melee range disable that goes through magic immunity (along with passive bash)
- New item Rod of Atos requires a Vit Booster and 2 Staffs of Wizardry, gives you a castable 4 second 50% slow