Any phone with Lollipop 5.0, the latest version of Android, will be able to interface with the system after being plugged into the car's USB port. The Google Now cards you're familiar with on the phone will appear on the infotainment screen, and from there you're in a mobile Android world. A report in Edmunds says that Whatsapp will be an option from the start, and nifty Google tricks like "contextual search via voice control" respond to queries based on what's being discussed.
Although Bloomberg recently did a video examining the Google vs. Apple question, your choice won't be binary; in Hyundais, at least, both systems will be fitted, plugging a phone in will decide which one comes up on screen. We don't know when we'll see it dealerships, but the video will give you a glimpse into your Android future.