{{productID}} Pre-Defined variables

Is it me or is productID simply missing from the list of Pre-defined variables?

We see the key/value pair in the JSON when we publish a product-specific event…

{"data":"{\"deviceId\":\"someDeviceId\",\"args\":\"TESTING\",\"someKey\":true,\"someOtherKey\":true}","ttl":"60","published_at":"2017-04-08T12:13:06.223Z","coreid":"001","userid":"someuserID","version":null,"public":false,"productID":"<<HERE>>","name":"eventName"}