A answer to your question is that cox was bought out by xenalook out of canada , you can still buy parts or engines from them! I have bought many parts from gaskets to glow plugs. They get parts made for these engines.you can look on ebay also. I sent bernie a email he said that there is still some stuff there at Estes , molds for planes and he said that they have no idea what they have there nor do they care!
I don't think you will ever see any planes being reproduced such as the plastic ones, due to liabilty and also lack of interest. it was just a year or two that cox had those micro warbirds then pulled the plug altogether.Now those are being marketed by gravity. I hope this answers your question Iam sure other people from this forum could shed more light also! Mark