Now I seem to understand this finally.
"Exposure" before Lightroom 4 was really setting the
white point. Now it is sets what the name suggests that is the exposure.
Quote: As it says, th adjustment exposure is used to adjust the whites
.
true, but it's very misleading
Quote: In lightroom 4 this function is now called white.
.
Yes, this time it is named properly. "Whites" set the white point, "blacks" set the black point and "exposure" sets... exposure
Quote: And what was brightness is now called exposure.
In lightroom 4 "exposure" slider instead of adjusting white point adjusts actual exposure ("brightness" is a diffrent story as it affects mainly midtones)