In an interview with Top Gear, BMW Neue Klasse division head, Dr. Mike Reichelt, revealed this about the 2028 M3 G84s gas engine:
“We’re going to make it the best M car ever dynamically”, says the boss of BMW’s Neue Klasse division, Dr. Mike Reichelt. “We’re also going to offer it with a new type of six-cylinder engine, because we understand it may be early for some committed M fans to make the switch.
This will be interesting to see what he means by "new type" exactly.