Apparently now shipping.

https://www.thetruthaboutguns.com/si...ed-in-380-acp/

The linked Sig site answers many of the lingering questions I had:

"The P365-380 slide includes an optic cut compatible with the ROMEOZero Elite or any optic with the same footprint. Additionally, the dovetailed front and rear sights allow for effective co-witnessing in the proper configuration. Because the P365-380 shares the same fire control unit and grip module as all standard P365s it is compatible with all of the same accessories, such as flat triggers, FOXTROT lights, XSeries grip modules, etc. Each pistol includes (2) 10rd magazines (one flush fit and one extended) and a magazine loader standard."

No personal plans regarding this; just passing along news I found.