Few realize this, but multipage forms are a huge big deal. You get into fun stuff like sessions programming, cookies, and other things that no non-geek can handle. Think about validating every field across all pages, being able to return to any page without losing stuff, and retaining all form data from all pages before submitting, and then you'll have a tiny sense of how "fun" that is. So I don't see it happening in Contact Form 7 anytime soon.
I've investigated this in several systems that I use, and found nothing simple. So if I needed multipage forms, I would use something commercial, and save myself weeks of misery programming and fumbling, something like one of these:
Or I would use a one-page monster form, and maybe JQuery it to make it act like a multipage, but that's a big deal, too, and no, no plugins for that.
I see that Contact Form 7 has reached the "sweet spot" of popularity where people want hundreds more features, and all for free. Ouch. :) I have donated to the developer, by the way, and I hope others do.