While the initial pass of 'hard mode' raids are as Wycca described, I don't think it will be a HUGE amount of effort for future ideas like this to add some flavor to the hard modes in addition to what's already there in the 54 player version. Something like adding an addition ability or behavior to a boss for the hard modes is pretty easy really. I'm confused. Is this a reality (ie 'hard mode' is coming), or is this just conjecture of "would be neat if..." ?
SoD hard modes (only 36 PCs allowed to participate) are coming soon. Any other possible hard modes or additional changes for hard mode implimentation are just conjecture.