We have plans to add support for wizard in the forms. Currently you can create a single form with Form Widgets and hide them through java script when someone submits a value and click "next" button. In this case you will have only one "Submit" button that will be shown on the last stage. You can use our built-in layout editor for forms to set a specific css class to the form widgets which will allow you to find then through jQuery and call Show/Hide methods.
Another option to access the form widgets is creating a custom class that inherits from FormsControl. In this class there is a public property - FieldControls which gives you all Fields.
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