The technology to convert wifi signals into the placement and identity of people is getting much better. Not by using their devices, just the waves bouncing of their bodies. (There’s nothing new to the pipeline as far as I can tell, we’re just starting to get into the accuracy ranges that make it easy/useful.)
Similarly for a whole bunch of attack vectors. Reconstructing keystrokes from keyboard sounds has been demonstrated. But you need a quiet background and a close microphone. At which point you probably could have just plugged in an inconspicuous keylogger and be done with it.