Yup, it will. That page (resources.yesler.com/responsive-marketo-landing-page-template.html) is a Marketo landing page, and it's responsive. So you can see it on your iPhone as it shows up. Or you can simulate that by just making your browser skinnier. But don't judge the possibilities by prettiness of that page—I made that myself, and I'm no designer.
This landing page of ours is using the same methodology and pieces, but it's designed by an actual UI designer. Mostly it has a much better form for mobile/tablet.
So, forms, yes. Also dynamic snippets on the thank-you page.
Marketing Operations Specialist