From the back it looks like some kind of heavy laser turret
Sensible longer-range extrapolation of the probe droids’ venue. I take it the retractable pylons are intended to fine-tune sensor coverage?
I would guess that whenever it’s triggered those would deploy to fully activate the probe. Power saving, etc.
Probably the same idea behind the s-foils on X-wings as well. Travel vs fully active.
Fair-seeming analogy. Those panels wouldn’t look too bad on a heavy TIE design.