DotA 6.79 Changelogs! ChrisC from the Valve Developer has posted the changelogs for the Dota 6.79 updates in the Dota 2 forum. Even though the DotA 6.79 itself has yet available to download, it's really excited to see so many interesting changes in the DotA 6.79.

Dota 6.79 Changelogs
DotA 6.79 Map Download

GENERAL

* Buyback prevents gaining unreliable gold (creeps, neutrals, etc) until your normal respawn time finishes

* When buying back, 25% of the remaining respawn time will be added