Here is a scenario that we have in mind and I am not sure how I could achieve with Nintex Forms.
While I can define individual forms per Content Type, I could define Content Types per Request Type, but that way I could not have a cascade of forms opened in a sequence.
Instead users would have to open request items again and again.
Who nows about a good approach for a wizard style solution?
Nintex is working on a multi page form functionality in Nintex Forms. Right now you would need to put everything on one form. You can create a couple of panels that keep your "pages" and have them displayed or hidden once after another.
So on "page 1" only panel 1 is shown. If you click a control / button, your form will hide panel 1 but shows panel 2 which hold all controls from "page 2".
This video might be helpful for you: