Hiroyuki Sasaki, president of eyewear company Hakugan, displays a prototype model of eyewear with electroencephalogram (EEG) sensors. The device is the world's first EEG with eyewear as a stress free tool for brain wave tests. [Photo/Agencies]

Cars will work with GPS technology and sensors in parking meters, roads and home appliances to help route you around traffic and turn on your living-room lights as you approach the driveway. But that can also generate a detailed record of your whereabouts.

Thermostats from Nest and others will get smarter at conserving energy when you're away. Potential burglars might find that information handy.

Home security cameras are getting cheaper and more plentiful, but they're sometimes insecure themselves, especially if you set them up clumsily. There's already a website devoted to showing video from cameras with no passwords. Though they are mostly outdoor or business cameras, one was trained on a baby's crib, and another in a living room.

Wearable health devices will track your heart rate, fitness levels and more - and share achievements with friends and family. But slacking off may carry a heavier cost than those extra holiday pounds, particularly if your insurance company yanks discounts for meeting fitness goals.

Software from Google and Facebook will get even more refined to help you cut through the noise. That's great if Facebook is showing you posts from friends you already interact the most with, but will a long-lost friend's plea for help go unanswered because you don't see it?

The pending onslaught of privacy trade-offs might seem trivial when it comes to a talking-and listening-Barbie. But maybe it's less so when your phone knows enough about you to remind you it's time to leave for an important interview (if the alternative would be losing a shot at that job) or your smart home can really tell you if you turned off the oven before leaving for an international trip.

"The encroachments on our privacy are often self-inflicted in the sense that we will accept the trade-off one bit at a time," says John Palfrey, co-author of Interop: The Promise and Perils of Highly Interconnected Systems.

And these trade-offs can be quite subtle. Technological advances typically offer immediate, tangible benefits that, once you've put enough of them together, can indeed revolutionize daily life. Can you imagine living your life without a smartphone? A few years from now, you might goggle at the thought of managing your day without constant advice from Siri or "OK Google".