I signed up like a year ago, and never got a single email mentioning the CX-5. Eventually they started spamming me about the new Mazda 6. That really pissed me off.
Earlier inquiries got a response of, they are in final certification with EPA and CARB. Early this year, they got more generic, and said Mazda is still committed to bringing diesel to North America. The same thing they were saying when the diesel 6 was over a year late.
As far as I know, they never admitted that they reneged on their announcement that they were bringing a diesel 6.
If they announce a timevframe, I believe they are obliged to update when they know they won't meet, let alone when the timevframe has passed.