Great article that reflects the changes in the industry towards WSNs and new applications - the part that is missing in my opinion is the Energy Harvesting part!
New low power designs have open a wide door to EH solutions (wasn't realistic couple of years ago due to power budget)..these solutions, are been adopted by leading WS companies to resolve the battery limitations..
As for today, you can find multiple applications running on Solar, Vibration and Thermal harvesters connected to a supercap or rechargeable battery..
Zack Sharon, Sales & Marketing Director @Sol-Chip
Replay available now: A handful of emerging network technologies are competing to be the preferred wide-area connection for the Internet of Things. All claim lower costs and power use than cellular but none have wide deployment yet. Listen in as proponents of leading contenders make their case to be the metro or national IoT network of the future. Rick Merritt, EE Times Silicon Valley Bureau Chief, moderators this discussion. Join in and ask his guests questions.