I've personally developed and released multiple apps, and each app has had updates shortly after release. One was a rather embarrassing oversight. I didn't blame Apple, I blamed myself. I also used their expedite service to request a quick review for the update and was granted the expedited review. The updated application was approved within 2 days using that process. Apples process is frustrating, and can be extreemly aggravating, but I have to wonder how come they didn't have an application + iPad to use for their demo/tutorial. Creating an Adhoc version, as well as a corporate signed version are easy enough under restricted circumstances. (You can't distribute to everyone that way, but you can get it up and working on multiple devices so your client can review and test and train).