There are just two major changes in this release and that is pwmconfig improvements and new devices being recognized through sensors-detect. The pwmconfig utility is part of the LM_Sensors project and it looks for fan controllers that support PWM (Pulse Width Modulation) fans through the 4-pin interfaces that are now common on most newer motherboard. The pwmconfig cycles through each PWM control and attempts to turn off the fan followed by turning it back on, to verify its working state.
Jean notes though that while pwmconfig has been improved a lot in this 3.0.3 release, there's still a lot of work left and this utility may be rewritten in a different language.
In LM_Sensors 3.0.3, sensors-detect should now support about a dozen new devices and improved detection for about another six devices. Some of the LM_Sensors patches we've talked about recently include MacBook Air support, Intel Core i7 monitoring, and AMD Phenom support.
Some of the other devices now supported by LM_Sensors include the VIA C7 processors, SMSC EMC6D103, Maxim MAX6654/MAX6690, Texas Instruments THMC51, VIA VT1212, ITE IT8720, and Texas Instruments TMP411.
The LM_Sensors 3.0.3 release announcement can be read on the project's mailing list.