Yup, that's something that makes a device like the Surface Pro and other X86 devices so great.
We already have the Smithson Martin Emulator Modular that's designed for touch interfaces but it's a regular Windows application. It also has the added benefit of having access to all the standard Windows MIDI stuff that modern Win8 apps don't seem to have.
It doesn't do audio so it doesn't care about WASAPI or ASIO but if it did it would have access to ASIO because it's a regular desktop app. 

, contextfree` wrote

@dentaku: I agree. Note though that the new low-level APIs for multitouch in Windows 8 are also available to desktop apps so you can do something that way.