How long will Apple keep signing iOS 4 after 5 is out?

[zorinlynx]

If I run into showstopper bugs in iOS 5 that make me want to downgrade back to 4, will I be able to? I'm just wondering if Apple generally keeps signing the previous major release for at least a little while longer when a new release comes out, or if they stop signing right away.

I'm looking forward to iOS 5 but don't want some feature I use to be broken!

 

[spblat]

iOS upgrades are a one-way street, unless you take extraordinary measures before updating. Apple will probably update iOS 4 for a little while for people who don't update, but they will not give you an easy way to downgrade. I've been running iOS for a few days. What feature are you worried about?