I think that Toyota needs
I think that Toyota needs this as much as Mazda does. Toyota is desperate to stay at the forefront of the green car front and keep its branding in that regard. Hybrids have done their thing, but are beginning to be yesterday's news. Toyota doesn't have anything after hybrids - very little plug-in or battery-electric engineering. By adding Mazda's SKYACTIV high-compression engine tech, they jump ahead significantly and stay abreast of Ford, whose EcoBoost and Energi options are an obvious match. Further, Toyota doesn't have much in the way of turbocharging and Mazda has mastered it. It's a serious gain for Toyota in terms of time-to-market savings, I think.