You are forgetting that Lordaeron and Icecrown are not the same even if the rates are. Lordaeron does not have RDF enabled and the bosses are buffed - by making the rates more like Lordaeron, Icecrown will more a more friendly but also very blizzlike for people.
How does not prof rates effect the economy? Easier to level up the proffesion means that you can easier sell better items. It migth not make a huge diffrence, but thats the point. Making small changes that will not make to much diffrence for the players.
I think it is funny that people complain about that they have already played wotlk, so you can't do some stuff. Well, you are chosing to play wotlk now, so stop complaining.
They have also now released this information in such a good time before it actually will happen, that you can complete all these problems you have before they change the rates.
It is funny with people that say that they dont want to do something, because they have already done everything on wotlkk a million times, yet they play.