If you read the official site today, you will know much about the Dual Spec. According to Ghostcrawler we know:
As a few people have pointed out, hardcore raiding guilds already respec in between bosses. All it takes is a little bit of patience, wow gold and maybe a warlock. The new feature just takes some of the busy work out of it by remembering say what spell you had on button 2 or button 3.
What the new feature really is supposed to do is let you change your mind. Oh, I was going to PvP tonight but now my buddies want to do Naxx 10 instead. I can flip on the fly instead of having to run back to Org or IF to respec and get summoned.
Very skilled or "into it" dps players absolutely can maximize their trash or boss dps through their spec. In fact, you hear a lot that certain talents aren't good for bosses because they do things like improve your down time, AE or survivability. But all of those things can be great for fast clears. Players also sometimes say (silly) things like how they only care about how they perform on a boss. But if you want to do something like the LK equivalent of a ZA fast clear for the bear mount, you need to be fast across the board, not just on the 4 bosses. Players wipe on trash too.
We're not going to make crazy fights where we expect the entire raid to respec into something weird. That was even asked at Blizzcon and the guy in charge of all of the boss design said simply "No" in reply. If we can't assume you have a warrior or druid tanking, then we can't assume you have a mage with an obscure talent build or 12 healers or something else abnormal.
Having to run to town to respec all the time between two common specs was a burden, just like pots and drums were a burden. Very few players enjoyed having to farm consumables for their raid night. (Though to be fair, some did). Players may have enjoyed the advatantage those consumables might have given them, but of course they forget that the encounters were designed around the expectation that the group was chain potting and doing drum rotations. The encounters should be of similar difficulty, with the major change being that you don't have to farm (as much).
Likewise, I understand that some players like having to commit to a talent spec at least for the night. Those players may feel that this is a "catering to the casuals" decision, but it's one we think is right for the game. The different needs, for example, of PvE and PvP combat were putting a lot of constraints on the design of talent trees. Every talent needed to be very useful in both modes, which also tended to make them overbudget. That's not the only reason for the feature, but it's still a good one.
We won't let you change specs within an Arena or BG, nor will we let you do it in combat of any kind. When the feature is fleshed out more, we'll let you know more details.
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