  Wi-Fi is among the most successful wireless technologies ever invented. As
Wi-Fi becomes more and more present in public and private spaces, it becomes
natural to leverage its ubiquitousness to implement groundbreaking wireless
sensing applications such as human presence detection, activity recognition,
and object tracking, just to name a few. This paper reports ongoing efforts by
the IEEE 802.11bf Task Group (TGbf), which is defining the appropriate
modifications to existing Wi-Fi standards to enhance sensing capabilities
through 802.11-compliant waveforms. We summarize objectives and timeline of
TGbf, and discuss some of the most interesting proposed technical features
discussed so far. We also introduce a roadmap of research challenges pertaining
to Wi-Fi sensing and its integration with future Wi-Fi technologies and
emerging spectrum bands, hoping to elicit further activities by both the
research community and TGbf.
