They are testing some new pine wood chip substrates (potting soils) that aren't composted yet and showing some promising results. One of the southern pine area universities holds the patent on the process. Sorry I can't remember which one. It was in an article in GPN or one of those free trade publication magazines recently. I think it'll be out in the next few years.
update: i found it! link below:
Grinding Pine Logs To Use As A Container Substrate
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