Unfortunately, we don't have this feature yet. I don't think this would be too difficult to implement, but I'm not sure how high of a priority this would be for us. I would personally love to see Serato library importing in Mixxx though.
If anyone is interested in hacking on something like this, I've written some C code that decodes the Serato library. I don't think I've explicitly handled cue points, but it shouldn't be more than a few lines to add that. Please email me if anyone's interested in this ( [email protected]
I'll see if any of our developers want to take a crack at it in the meantime.