The new version of Force of Nature lowers its mana cost by 1, but removes Charge and makes the summoned Treants permanent—like the other Treants that Druids summon. This change also removes the powerful one-turn combo of Force of Nature and Savage Roar. Now, opponents will have a chance to deal with the threat that the Treants represent, and it won’t feel mandatory to always include the combo.
This. Savage Roar is a ridiculous card. Glad the Force of Nature change hasn't completely killed the card or at least, it still looks like it may be playable, although I'm probably being too optimistic.