According to the FAQ -- "No. Once you publish content to the App Store with Single Edition, updates are not available to that content."
But, within the forums people claim that you can fix typos etc. in a published Single Edition. Can someone clear this up? Would I be able to make text changes to a published Single Edition?
What I've seen Adobe say on here in the past is that when an update the app changes the intent of the content, it is not acceptable. However, making grammatical or typographical corrections seem to fall within a category of accepted use.
Updating your Single Issue app to include a Spring catalog instead of the outdated Winter catalog, however, would not qualify as accepted use.
Probably want to speak directly to your reseller or Adobe about the specifics though.