Hmm... I think hermione may like Viktor Krum. But maybe she just likes him as a friend. She does think he's kinder towards her than Ron and Harry. I do expect her to mature emotionally soon, though. She's already showing signs of it, even though she still tends to get crushes that defy all logic.
Ginny adores Harry, but I don't think he has similar feelings for her.
As for Cho... I don't know what she will do now that she lost Cedric; she might turn to Harry, or maybe not. In any case, her heart won't be having a good time by the beginning of #5.