Expect An iOS 9.1 Downgrade to Last For 1-2 Weeks
Expect Apple to keep the iOS 9.1 downgrade open for a week or two after the iOS 9.2 release date.
Apple will almost certainly keep signing off on iOS 9.1 after the release of iOS 9.2. It won't sign off on it forever though.
The company typically closes up the loophole one to two weeks after a release and we wouldn't expect any miracles from iOS 9.2/iOS 9.1.
If you want to downgrade, you'll need to move quickly.
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