Last night MuscleNerd announce that redsn0w 0.9.6 rc8 will be available for all iDevices users. During this night, echpa published this new beta version on its own website, but did not publish the changes it brings. MuslceNerd mentioned only one thing about pngs that can be used as boot logo, so I assume that this is the only major change that this new version of redsn0w brings.
You can jailbreak iOS 4.2.1 with redsnow 0.9.6 rc8 using the instructions of here.
You can download redsn0w 0.9.6 rc8 from here: [download id=”111, 112″]