This absolutely makes sense.
I told here few years ago when MB announced inline 6 engines that last laugh has BMW in this. Inline 6 engines are necessary bcs. of modularity. MB went that way, FCA is going that way, Mazda is going that way. It is much cheaper to make inline 6 and on same line 4 banger. Mazda obviously needs 6cyl engine to expand portfolio. It is cheaper to make inline 6 together with 4 banger on same line, regardless that inline 6 is actually more expensive and not as capable to use it it various other vehicles (anything transverse or minivans. Though Volvo might say they could, but not sure who wants transverse inline 6) than going V6 route. On top of that, inline 6 is anyway better engine, add to that RWD and longitudinal layout and Mazda is going to be far more serious option for enthusiasts than anything Toyota, Honda etc. With this vehicle they actually have a shot at luxury segment. Longitudinal layout will offer better weight distribution, it allows much more complex suspension in the front. They could easily go with double wishbone in longitudinal layout if the choose so. Add manual and option without hybrid, and I could seriously look at that vehicle.