Later after the iPad event, Apple released iOS 7.0.3 to bring some fixes for lockscreen, accelerometer, motion sickness and more. We've informed you previously that MuscleNerd, the well known iPhone hacker, warned users to update to iOS 7.0.3 until he's sure that it's safe.
Today, MuscleNerd sent a tweet saying that iOS 7.0.3 won't impact the jailbreak, which is means that it's safe for jailbreak.
MuscleNerd: 7.0.3's lock screen fixes won't impact the JB (unless Apple's holding back here, hah! http://lists.apple.com/archives/secur... )
However, if you're on iOS 6.1.3/6.1.4, it's better to stay on it:
iphonesteven: @MuscleNerd so is it safe to update to 7.0.3. ?
MuscleNerd: @iphonesteven If you've already lost the JB by upgrading to 7.x, then yep it's fine to go from 7.0.x to 7.0.3.
There's no specific release date for iOS 7.0.3 untethered jailbreak but as far as we know, it will be before the Christmas