I've noticed that the modem firmware of the iPhone 5 on iOS 7 GM changes from "3.04.25(iOS 6.1.4's modem firmware" to "5.00.01". will this affect anything when the jailbreak for iOS 6.1.4 comes out?
From previous experiences i've had with downgrading your firmware. I've notice that the current firmware's modem firmware remains at the latest version and not revert back to an older one.