If you ever run into a problem with an app you published in Apple's App Store, and want to update it as fast as possible, you can ask the Apple review team for an "expedited review" explaining the problem.
How to ask Apple for an "expedited" review?
In iTunes Connect, select “Resources and help” then “Contact Us”. From the list of topics, select "App Review", then "Request Expedited Review", and fill out the form.
While your request does not give you any guarantee, in many cases the request is taken into account and your update will be approved faster.