Unlike Classic, Blizzard hasl the data from the TBC patches, this means they can decide what numbers and data they use for the trash and bosses in raids and heroics.
Blizzard, I’m begging you, release TBC with the original difficulty of Kara, Heroics, etc. There is NO downside. Players will still be able to accomplish all of the raids easily, I am not saying they won’'t, but I think we all would enjoy those early weeks of TBC if the content packed a little more punch. I remember doing my first heroic Ramparts as a tank and having to be so methodical and carefully pull mobs and CC them properly. That is something Classic has lacked because of a variety of factors. If the heroics are in their original state, we as players, will actually have to CC those first few weeks. which would be awesome for once.
Numbers wise it might not make a HUGE difference, but psychologically, I know lots of players will feel like it matters more, if we knew the heroics and raids were in their original state. It doesn’t feel good doing raids we know have already been nerfed to pre-WOTLK patch levels.
On that note please make the reputations require revered and everyone needs the Kara key to get in. This only adds longevity and more things to do, while also giving slow levelers more people to play with because there will be plenty of alts needing to do the grinds as well.