So that sounds like they found a strategy that lowers NOx without needing SCR and DEF fluid. Probably all new combustion chamber design, more EGR, better EGR cooling, etc.
Guaranteed it will still have a particulate filter.
The end game here with the next bump in Tier compliance will most likely be forcing manufacturers to redesign the entire engine and fuel system.
This will cause reliability issues due to production and manufacturing changes, retooling, etc. There will be a lag in technician training, parts availability, etc. The EPA will mandate the mileage warranty increase on these new systems to ensure proper operation. That will drive pricing up, force you into an even deeper relationship with the dealer.
There is zero light at the end of the tunnel. Not to be political but unless we get a government that says what the EPA did with these regulations is wrong, which the courts have already deemed true, with political figures walking back this bullshit. People realizing that the new upcoming economies of the world (China, India, etc.) are polluting infinity more then us. Will we ever get a break.
Otherwise keep stroking it and move to a state where your delete kit is overlooked. ITS NEVER GETTING BETTER FOR DIESEL ENGINES...PERIOD