On Ryan's Beta Todo List is the following at the end:

Attribute enhancements - images per attribute, dependent attributes, required attributes and different form element types

The so called "color swatches" where you can hover over a color and than the picture is changing according to the color could be a major enhancement that will and could help Ubercart to be the breaking edge shopping cart system available. I guess it is pretty usefull for clothing or t-shirt stores and any other store that handles colors..... I belive there are many.

The idea is now to create a donation pool for the Attribute enhancement.. people who are defenitly want to see that feature in the core ubercart and not as a contribution module. Everybody who wants to see and donate money for it, post here please. Thank you!