which software sample can read the pitch of any wav file and automap samples. It should be similar to the NNXT in Reason, but be a VST or Stand alone.

Trancevision

Not sure on reading the key, but Recycle is very good at processing loops.

halion or kontakt should do the job..

I don't think Halion will read the key/pitch of your sample. You need to select a rout key and a hi/low range for mapping it.

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you can try NI's Intakt which is a combination of their Kontakt sampler and the ReCycle/Dr.Rex engine. however, in my studio i use ReCycle to beatmap and chop the samples. then i import them into Kontakt.