A post on the official Dota 2 blog has highlighted the superb replay tools that'll feature when the game gets released next year. The tools were hinted at during the Dota 2 tournament that took place at Gamescom. According to the blog "replays are an important part of the Dota experience." This is especially significant seeing as Dota 2's current main competitor, League of Legends, doesn't support any form of spectator mode at present.
The in-game tools will highlight matches played by your friends and your favourite teams.
2DayBlog.com, Dota 2's replay tools detailed. Commentaries, recommendations and player cams incoming