Blizzard has released a blog covering Hero Talents in War Within, with high quality hero talent icons!
Players can choose a single Hero Talent tree to activate on a character and these talents can be changed in the same way class talents can be currently changed in the game. There are three Hero Talent trees for each class (excepting druid with four and demon hunter with two). Each specialization has two Hero Talent trees they can choose between, and each of these trees is available as an option for two specializations.
There are 11 nodes in a Hero Talent tree.
The first of these unlocks with the system at level 71, and you earn 1 talent point per level from level 71 to 80, so you get every talent in the tree by level 80.
Each Hero Talent tree starts with a “keystone” talent that introduces the core mechanic and concept of the tree. This could be a new ability, an enhancement to an existing ability or cooldown, or a new buff you can trigger.
The bottom talent of each tree is a “capstone” talent that builds on the core themes of the tree or adds new power to the keystone.
Each tree will offer or modify some class utility and include defensive bonuses that are useful to all specializations. We are aiming for all trees to be about equal in the amount of utility and defensiveness they provide. Trees for characters that can take on a tanking role may have some additional defense bonuses that will be less valuable to healers or damage dealers (DPS), such as bonuses to tank talents or cooldowns.