Does anyone know how modal views will be on the iPad once iOS 7 comes out?
I have a button on the screen that triggers a login-type form. On the iPhone a normal modal or pull-up view works great but how would this look/behave on iOS 7.
Short answer: there's no required behavior change from iOS 6 to iOS 7 for modal screens - only the recommended styles (and how 'tint' color) changes.
See the Temporary Views page in the iOS 7 UI Transition Guide. Modal Views are the last element covered on that page. One small change you may want to take advantage of, straight out of the documentation:
Links to those resources are included on that page (see first link).