It's really about time. I am shocked, though I shouldn't be that GM is releasing the smaller diesel in Europe first.
"The Duramax is package-protected for closed-loop cylinder pressure monitoring, a technology GM will introduce on its new 2.9-L turbodiesel V6 next year in Europe."
So, the 1/4 ton issue is fairly moot IMHO. Of course the 4.5L might not be a solution for say a Malibu, but the 2.9L might do the trick for most of the car lines domestically. The 4.5L I see as a Suburban, Tahoe, Silverado (and their GMC and Caddy similar lines) offering. **Might** even make it's way into the 3/4 ton and larger markets too....but I'm just speculating here.....