The Nintex Mobile app is something that is really cool for allowing users to fill in forms from their mobile device, rather than going through a browser.
At this stage (May 23rd 2014), there is a Windows 8 app and an iOS app. In order to use the mobile app, you need to point it to a SharePoint environment where you have built Nintex Forms. If you are currently in a position where you are looking into a forms solution for SharePoint, you may not have Nintex Forms installed just yet. If you still want to have a look at the Nintex Mobile app to get a feel for it, it now supports a trial. You can navigate to the store on your mobile device, install the Nintex Mobile app and when you run it, click on the trial link at the bottom of the app.
You’ll then get an email with a url to a SharePoint environment and some credentials which you can then enter in the Nintex Mobile app. This should give you a good feel for the mobile app and some example of forms and tasks forms that you can have.
Please excuse the background noise in this video. I’m not sure what happened there.