I'm just hoping they release this, as well as all the other Art and Sport series lenses, in Sony E-mount. After all, they've recently said they're planning to produce mor E-mount lenses, and there are surely far more E-mount users than Sigma mount or even A-mount users - enough to justify diverting a production line. Or, if mechanics is an issue, to rework them with motors suited to combined phase-detection and contrast-detection (or intelligent pattern-recognition) use, while keeping the optics the same.
I hope they also release lens profiles to work with all the common converters (ACR, Canon's and Sony's in-house converters, Capture One, etc.) so that it negates the one remaining major advantage of OEM lenses - the ability to automatically and flawlessly correct for distortion, CA and other optical aberrations. Current tools aren't that great for removing complex distortions - fix one corner of an image and the other side gets worse, since it's not a simple linear pattern.