Razer's latest is the Junglecat, an iPhone 5/5s specific gaming controller. It features a full d-pad, four face buttons, and two bumpers. Unlike some of the competition, you'll be able to hide the controller by simply sliding it out of view.
The Junglecat is 20mm thin, and Razer says it feels like a standard protective case. Hard to judge based on pictures, as it does look kind of beefy. Speaking of beefy, the Junglecat is going to run at $99.99 / €99.99.
Part of the package will include an app that will let you remap and define all of the button functions, and you'll be able to store up to 20 personalized control options. The app will also keep users up-to-date on the latest available games that take advantage of controller support. It will do the same even if it's another brand's iOS controller, which is pretty rad of them to allow that at all.
If you're interested in the Junglecat it will be released through the RazerStore this July.