That depends on what ARR is like. I can see GLD/PLD needing a offense boost because of the mostly solo leveling system, and a boost doesnt need to put PLD on the level of a DPS class/job. After the tank rebalancing of Wrath, a tank could be doing 10-15% of the total damage done to any given trash mob or boss, as opposed to their less than 5% during BC, and they simply reduced the agro gain of certain talents to compensate. It increased further in Cataclysm, dunno about MoP. It also helped them to do quests, instead of having to re-spec to dps mode just to quest, you can stay as tank spec.
Trash tanking could very well become as important as trash tanking was in WoW. More than enough dungeon and raid dungeons in WoW required Trash to be tanked by a tank no matter what it was. They didn't all die in less than 15 seconds, and squishes were squishy. Non-tank decides to be the focus of a group of trash inside of a raid instance, dead in 3 seconds. If they are using WoW for insiration as they said, I expect ARR dungeons to feature tanking of every enemy within by a tank as well.
I know I would have been very disapointed if they continued with the AoE tank/Boss tank theme, because the First trash in ICC..... fun times.