I've not been as active on the forum recently due to skiing/snowboarding season and work. But I don't believe we'll see the 1.3 in the 124 any time soon. From what I can tell Fiat is doing very little investment in continuing the 124. That doesn't mean they are going to stop it, but if they can't even invest almost no money in getting Apple CarPlay or any of the other Miata 2019 improvements (e.g. door hinges, tilt/telescope steering wheel etc) then I don't see them making the much more significant investment to change the engine to the 1.3.
Remember that the car is built on the Miata production line, so the cost to switch to the 1.3 will be higher than if it was a FCA production line
Just my thoughts, I don't have any inside information on this.
2006 MX-5 Roadster Coupe - Stormy Blue - SOLD (Australia)
2011 CX-9 GT - light blue (USA)
2019 124 Abarth (USA) - White, Manual, Recaro, Brembo, Veleno Appearance, Visibility, Navigation & Sound, Convenience, Record Monza Exhaust.
Mods: chrome Abarth badges, CarPlay, GENK80A frameless mirror, PTP Turbo Blanket, EC P1-P2 tune, EC V4 intake, EC Intercooler, EC Oil Catch Can, Forge recirculating BOV, alcantara bits, red door piping, led bulb conversion, stubby, MX5Things stuff!