That seems like a catch all blog, that at least to me gave little clue as to what they were working on.
On that note i seem to recall them working on a small web server and auto-discovery system that allowed any mobile device to share something. To me that seems like the perfect IoT starting point, as now you do not need an app for every damn device.
Unfortunately, I'm a little wary of trusting mozilla to support their groundbreaking/interesting-to-developer projects anymore (for better or for worse, many people applaud their renewed focus on Firefox)
Mozilla is working on IoT products and an IoT platform based on the Web of Things.