It bothered me before that I'd be missing good stories because I mistook them for okay artwork, and that I'd sometimes click on good artwork only to find that it was really a story by someone else. There may still be a neater way of solving these problems, but for me the current way of dealing with lit preview images is a vast improvement.
I sort of agree with *wei-en, but personally I like having preview text. Without it, you've got to click before you've got any idea what the story/poem is about/like. Maybe if the text appeared after a mouse-over of the preview image (with a lit tag next to it so you know it's actually literature), that might look better.
As far as I've seen, now most preview images cover literature written in .pdf, which, with my old and messed up computer, I can't read. If the users of preview images left the text unaltered, not in .pdf, I'd be a lot happier with them and I wouldn't have voted a thumbs down.
I like that they've changed how it looks so people don't get confused anymore, but now it's not as visually appealing...I think if they tweak it a bit more to remove the preview text (maybe) but still incorporate the other components it will be great.
That being said, it doesn't make much of a difference to me because I don't use the cover images an don't see them that often.