the next thing they're working on according to the article is auto scraps. like tires and plastic parts
There was an article in one of the Scientific monthlies a while back that talked about this technology. Apparently they can make oil out of virtually any organic substance. Only the efficiency varies. The Turkey thing was merely because they wanted to get rid of the turkey stuff anyway, and this process is very efficient at it, and the by-products are litterally EPA approved as "products", rather than "waste", which changes the approval process around completly.
They apparently already have run tests turning human waste into oil. I don't know their costs for that, but the original article mentioned $18per barrel for turning Turkey guts to oil.