That time frame is late Q4, waiting on the EPA certs to come through. Ram DT still is not certified in Cali. Ram 1500 Classic is out now, but those are older engines.
to the best of my knowledge Jeep hasn't been certified either
I have a pretty good in........What is your source?
I'm not doubting you, just curious.
I'm not convinced the hold up is EPA/CARB but it isn't outside the realm of possibility. My main reason is that when FCA was caught cheating with the last gen Ecodiesel, it was re-certified for sale in ~6-8 months. That seems like a reasonable turn around considering they were caught cheating so I have a hard time believing the Jeep multi-year delays are because the EPA is dragging their feet. I'm not even sure you call it a delay since FCA hasn't even officially confirmed the diesel is coming to the Wrangler AFAIK.
I'd also argue that just because the new engine doesn't have certification doesn't mean the EPA is the hold up. I would assume certification is one of the last things they'd file for when working on a new engine.
Source for re-certification timing: http://fcauthority.com/2017/08/fcas-ecodiesel-v6-epa-certified-for-the-2017-model-year/
California is the hold up, not the EPA. We are waiting on the California certification, and then will launch. Jeep is confirmed too.