There have been a lot of leaks with detailed images and mockups but there is nothing that beats interactivity. Probably the best thing to give you some idea of what to expect come the release of the Next-Gen iPhone and iPad Mini is a good old interactive 3d model that is the closest thing to actually holding the device so without further ado, here are some mockups.
This was released today by Macrumors, it shows the 7" iPad rumoured to be as thin as the current iPod Touch and to have the same specs at the iPad 2.
This iPhone 5 mockup is a bit old as you can see the bezel on the top and bottom is a bit longer than recent leaks making the phone longer than it is expected to be. But it is the only interactive 3d one so we included some pictures of the recent leaks below for comparison.