I'm really interested in this too.
Impluse response would be nice to know too ... but that's only going to come from someone that might have been in a position to have measured the original and the new driver (e.g.
@Tyll Hertsens).
My concerns over the dramatic shift in spec (and 2.3x hike in power needed to drive them to the same levels) were a big part in my deciding to cancel my LCD-4 order and see how this all plays out. In the mean time I wound up buying the Abyss, so I'm probably going to wait the year out and see where the LCD-4 are then - but I'm still incredibly curious to see how things have changed.