A free Wolfram Player app has been available on the Apple app store since 19 September, with a bug-fix update today. As it stands I can download .nb and .cdf files onto it via Dropbox, and the app allows me to read them. If I try to run a Manipulate, an "Enable Interactivity" button appears that leads to an in-app purchase to "enable full interactivity".
My question is: what does this mean? I expect it will run Manipulate calls - how about numerical or text entry via keyboard? I'd like to know to what extent this purchase would allow me to use the power of Mathematica on my iPad. I can find very little information online, and the app's own help system looks like a copy of Mathematica's documentation center, not help for the iOS app itself. I did try Wolfram Technical Support at the weekend - no answer yet, and in any case the problem then (not even getting as far as the IAP option) appears to have been solved by today's update.
An assertion that the IAP provides the same functions as the CDF player on any other platform would be a fine answer to my question, if there is supporting evidence (preferably first-hand experience)!