After tracing is released and span context store support ticket is done () there is nothing that stops us in providing support for asynchronous invocations in the same JVM that's done on basis of ExecutorServices.
Some of the requirements:
Support trace propagation by changing the Runnables and Callabes that are passed to the ExecutorService if trace has been started
Intercepts these in the new server remote sensor
Provide correct properties for the propagation type and reference