Tornado proc rate reduce by more than 50% from 0.2 to 0.08. They are smart putting numbers instead of percentage if not a lot of barb will be crying in the forum on the proc rate of the tornado.

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Added on September 21, 2012, 11:27 am

That means how much times the tornado will hit the enemies, which in effect affects the ticks that the tornado hitting the enemies. If last time it takes 5 ticks to kill a skeleton with a single tornado, it will now require 11-12 ticks to kill them.

Which means it will affect the amount of fury generated, in return you will be fury starved due to the proc rate is reduced.

That means later you will either need to balance your barb to have DPS or using a mighty weapon to make up for the loss of the fury generation for WW players.