Pretend that Blizzard has announced that that have crunched some numbers and determined that adding additional tank specs will improve LFR and Heroic queue times significantly. To equal the cost of adding a new class, they have decided three of the remaining non-tank classes will be receiving a 4th Tanking spec. No other classes will get an additional 4th spec until a later date. The other 3 specs for each class chosen will not be removed or changed significantly.
Which classes do you want to see get an additional Tank spec?