Akbaba missile is a classified development, until someone decides to use it for political means. But it has all the wholemarks that it is still progressing.
According to technical information coming out of Roketsan, it is powered by a solid fuelled ramjet engine.
Although no specifics have been released, it is logical to assume that it is going to be similar to the meteor missile.
Since it is an anti radiation missile and has to seek for radiation sources; Hence may have to loiter whilst searching (even though it hasn’t been mentioned that it will) , it may have to have a throttle controlled propulsion.
So it will have to have a booster stage to bring the ramjet in to operation, whose solid fuel may have to be stored in the combustion chamber. Once this is depleted, the solid fuel for the ramjet propulsion that is stuck on to the inner periphery of the combustion chamber is peeled off in layers as and when needed giving controlled throttle and variable speed capability.
This is a very special technology. If Roketsan has managed to apply it, then they need to be highly commended.