There isn't any news on this front that I can announce right now. The iPad does have support for most current applications for the iPhone - so it will already be possible for you to run the current version of Tonetable on the iPad.
I contacted inklen about possibly expanding the control surface to cover the iPad's screen real-estate, I had suggested skins, pitch notches, and, a heads up display (basically somewhere on the screen that says +/- pitch variation), basically for the layout to be similar to that of a turntable, allowing the DJ to take better control.
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There isn't any news on this front that I can announce right now. The iPad does have support for most current applications for the iPhone - so it will already be possible for you to run the current version of Tonetable on the iPad.