When can we expect mobile app?
According to the road map beta version of the mobile app is released in March, the app will likely appear after the end of the sale.
Will app be available on all mobile OS's?
Android for shure, don't know for iOS according to latest issues....
Internal issues or something regarding restrictions iOS has put on ICOs?
As far as I know those issues are regarding ICOs.
I think they haven't changed their policy around this and probably won't change it anytime soon which is too bad.
On the one hand, it's bad because projects only have one option, but Android is very well represented, so there will be plenty of users.
I've often wondered why this policy was implemented and wether they will change it anytime soon. It seems it is not really going to change so most people should adapt either by investing in some other way or apart from ICO.