Really hope this goes somewhere for the developers, I much prefer the paid model (I pay for Fastmail for example) and would certainly consider paying for a really good app/service. As someone else mentioned, they would do well to at least confirm the existence of other platforms (like Android) and any plans they may (or may not) have. However going iOS first they do stand a good chance of getting Gruber, Dalrymple, Marco etc posting about it as they love those iOS exclusives these days ("iOS is superior because we get apps like this" type posts). I don't blame them going iOS first, but ignoring everything else is definitely a bad idea. Good luck anyway, if you get an Android app will be sure to try it.