Melodyne software has BEEN out.
Version 2.6 just dropped not too long ago.
You don't need to go to a seminar to hear it, just click here:
http://www.celemony.com
Watch the movie, download the demo, do the tutorial, and have fun.
That's what I did, and I bought it 1 month later. If it looks too pricey, there's supposed to be a 1-track version coming out, but not as yet.
I can't compare it to autotune (never used it), but I can say that it works like a charm. I don't even fuck with it for autotune-ish purposes, though.
Version 2.6 brought some additional sensitivity to the detection side of things - right on time.
As for working with other software via Rewire or the Melodyne Bridge - bet that up. It works...