New Estes Engine Retention?

One of the "Coming Soon" E2X models is the Sky Cruiser. It's a tall model, BT-50 to BT-5.

I looked at the instructions and noticed the engine retention cap.
This new "cap" is more like a smaller version of the 24mm and 29mm retainers.

Maybe we'll see these smaller retainers made for BT-50 based, 18mm models.
I realize this model has a plastic fin can, but a thread unit (alone) for BT-50 models would be cool.