New Hero in 6.68!

Icefrog has indicated that a new hero/heroes will be released in the next map update v6.68. As he answers a visitor message on his playdota profile.

Originally Posted by IceFrog

      Quote: sniperattack
      Are there any new heroes coming in 6.68?

Yes

Source

Although no other information has been revealed by him if the hero is agility/intelligence/strength type. You can join the discussion on the new hero on the official dota forums at playdota.com - Thread Link.