I already updated my phone. Is the iOS update that patches this available over a cell network? If not, as is usually the case, isn't that Not Good?
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I'm currently on vacation, which means that most of the wifi hotspots I'm connecting to are public. That's a big security risk in itself
If your wifi chipset is known to be compromised, and there is a remote exploit available, as in this case, then merely connecting with wifi to an evil hotspot is enough to compromise a device.
Once a device's been compromised, crypto signatures on update files won't protect you, as the signature checking itself can no longer be trusted.