The beta version of the upcoming DotA 6.75 map has just got leaked along with a great list of recent changelogs.
The Beta 5 map features the new Roshan's location and some hero changes whereas the changelogs reveal tons of interesting balancing, content and a new hero Frost Wyrm.
This beta has new Roshan's Den and Phoenix new ability "Overheat", other changes are not yet confirmed.
More changelogs and download:
Map Dota 6.75 beta
Dota 6.75 beta map - update and changelogs