I wouldn't depend on rumors from Car and Driver. They are rarely correct.Nobody does long reveals like Mazda. Making us guess at a bedsheet's hidden contents. Hopefully the time is used well, to bring a refined 70 to the market.
Edit- i notice that Car and Driver states it will have a shorter wheelbase than the 90, which to me ends the rumour of similar dimensions between the two models. I didn't believe they would as it seemed silly, but the rumour had some staying power.