Wenn alles gut läuft, bekommen alle die Gameplayänderungen noch vorm kommenden Addon per Patch und somit kostenfrei.
Zitat von: Grimiku am 21.08.2013 (Source)
We want to implement a lot of the new systems and features in a pre-expansion patch for free. That should include Paragon 2.0, Loot 2.0, Loot Runs, and Nephalem Trials. For now, you'll need to purchase the expansion to play as the Crusader, explore Act V, unlock the Mystic, and level up to 70. These details may change as development moves along, but we want some of the core gameplay improvements to be available for everyone.