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replied on November 21, 2013
Forms supports mobile browsing (on non-administrative pages like when a user is filling out a form) on iPad 2 or higher.
If I understand you correctly, you would like the forms that users fill out to have a responsive layout that handles a variety of screen resolutions. If that's the case, it is tricky to achieve at the product-level because responsive design is dependent on the elements present on the form. Each form will probably want to have a different responsive design, so it's something that you'll want to implement on a form-by-form basis. As it is now, you can use the Script page to add your own CSS and JavaScript to make the Form responsive.
I haven't seen a responsive site do what you mentioned as an example. If it is possible with responsive design, it should be something you can add to a form with your own CSS and JavaScript.There's no reason why the responsive design you implement for your forms in 9.0 wouldn't translate when you upgrade to 9.1.
If you want to get started using responsive design, there are myriad resources available on the internet. Check out this guide to CSS media queries.
In future versions of the product, we'd love to offer users a friendly interface for more sophisticated layouts like what you're describing.