Apple today has released another version of iOS 4.2 to developers. Along with the firmware release, Apple has also released iTunes 10.1 beta and a new version of the iOS SDK.
The new SDK is build 10M2409 and the firmware is build 8C5101c. There are seven distinct downloads, one each for the iPhone 4/3GS/3G, iPod Touch 2G/3G/4G, and the iPad.
This latest build, which comes just under two weeks since the last build (normally released every two weeks), continues to focus on the proximity sensor issue with the iPhone 4, which was not turning off/on properly when people were handling calls.
Additional beta enhancements and fixes will be reported as they develop.