A few screenshots show that Ubuntu is still going dark. The direction they are headed is not very clear. Even by scanning other user’s comments it appears its not a very popular idea, and I agree 100%! Here are 5 reasons a dark theme will only hurt Ubuntu:

1. If they’re trying to prove a point that dark themes are pretty, I think they’re just going to satisfy the ones who already love dark themes,.. in which case those users probably have a custom theme they enjoy already. They’re not going to get the votes of mom, dad, grandma, and grandpa, who until they satisfy, Linux in general will always be an underachiever.

2. The darker theme, no matter how great the graphics, will only be eye-popping on higher end machines,

More Here