this will be the first diesel offering (in the US) in a very long time (if ever, actually...somebody give me some real data..)
Yes, it is true that diesels are on the rise, and I'm sure thats why Mazda is jumping on board, but the diesel market is still MUCH smaller than the gas market..just look at a random gas station any given day...(although you live in CA, and CA is weird...so maybe there is a market there...)
At least for BMW, their X5 diesel sells about 40% of total X5 sales in the US market. Much higher for the other markets obviously.
The 335d like I have sold pretty slowly and may not be coming back in the new model. Wish I could understand why this market dislikes diesel so much, I love mine! Tons of power and incredible fuel economy.