v1088 does not require iOS 6.
Once you sign up with Apple as an iOS Developer (if you haven't already), it is recommended that you use Xcode 4.5 to be consistent with what they expect.
But, as long as you set the deployment target to 4.3, your v1088 should work on all iOS devices.
Since I use Xcode 4.5.2, that is what the templates I posted on the AppGameKit Wiki Templates page are created for. Sorry.
And I suspect that the Xcode iOS Player project was built using Xcode 4.5 as well. Apple encourages us to use the most recent stuff.
EDIT: Xcode 4.5 is required if you want to publish something that will work in iOS 6.
Cheers,
Ancient Lady
AGK Community Tester and AppGameKit Master