It isn’t 4.1, but Apple’s just gone and released an update for all of its iDevices out there. 4.0.1 is available for the iPhone and iPod touch, while 3.2.1 is here for any and all iPads out there.
The only change noted so far is the signal bar heights, shown here:
More as it happens! See any changes? Respond in the comments.
Update 1: Abcmsaj reports that 3.2.1 kills the Spirit exploit. He also says that iOS 4.0.1 patches the ultrasnow. Basically, as always, jailbreakers should wait until the Dev Team gives the green light on the update.
Update 2: We have reports that it isn’t available for iPod touch users, at least not yet.
Update 3: Per forum members mikeac and Mr. Dodi, it appears iOS 4.0.1 does not change the baseband, and can be jailbroken with the latest redsn0w. Only MB model devices can be jailbroken.