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Anyone have any idea what app is used in the lunatik touch pen promo materials?
While Autodesk Sketchbook (which Michael suggests) does appear in the promo video in your link, the app in the photo is Clibe (see for instance: http://www.knowyourapps.com/reviews/clibe/ ).
I clipped out the UI from one of the Clibe screenshots for comparison. I have not used the app myself.
There are multiple apps used in the video on that page, but at the 1:48 mark the app is Autodesk Sketchbook Pro for iPad.
Required, but never shown