My guess is that the new colored hulls are pale to avoid what Greg said - dark gelcoat colors look great new, but they don't stay that way long.
The lighter colors resist fading better than dark, or at least they don't look as bad when they do fade.
There is a flag blue 28 Southport CC on a lift near me that I fished on when it was new. Beautiful boat when new.
Now, 4 years later, the hull is a faded mess, mostly because the owner doesn't keep after it.
Think about it. Even our white hulls chalk up if we don't keep after them.
Colored gelcoat does the same, but the darker it is, the worse it looks.
Again, like Greg said... if you want color, your best bet is to paint it.
Parker is simply reacting to the other manufacturers, and to what customers say they want.
That tells me they are listening.