Description of problem: I was quite confused by the kernel changes that had the side effect of disabling almost all the lm_sensors info. Bug 496355 shows my confusion and the kernel changes which caused it as well as the kernel boot parameter that can be used to get old behavior. Seems like this would be good info to go in the release notes somewhere (if it is already there, I couldn't find it). The acpi_enforce_resources=lax boot parameter got back my sensor data, and copying the /etc/sensors3.conf file from fedora 10 got back my interpretation of that data.
Added to zero-day release notes. Basically, the release notes entry points to 496355, better to admonish people of the risks.