Glad to hear you built it with an eye towards having an Android version out quickly as well. Do you mind me asking if your team used something like PhoneGap to build the app, or was it custom built for each platform? (and the rational behind the decision if you have it.) Curious purely from a development standpoint, as I work in this industry.
As for offline use, that is absolutely vital that an app such as this use offline storage or the local database to cache the data so it can be used in places with low or no Internet access. I could see limiting the amount of data available, to keep within the storage limits of the tablets, but basic rankings and a paragraph about each player (the things likely to be needed in an app for draft day) shouldn't take up enough space to be worrisome from a technical limitation standpoint. I know the last live draft I was at, we did it at a BW3 and we dropped Internet a few times on the laptop we were using for the draft (thankfully, I was using DraftDominator to perform/store the draft, so it only impact my research, not the ability to continue the draft, plus we had the sticker board going.)