The next version of iPad is apparently going to support MIDI (presumably through am expesnive proprietary dongle like the iPad does for hooking up cameras to download photos).
I enjoy making beats with the KORG iELECTRIBE on my iPad but I doubt he'd be making whole albums on it
This version of the iPad supports MIDI. It's not really the iPad hardware, it's the software. iOS 4.2, which releases in a few days, has MIDI hardware support via WiFi MIDI or MIDI over USB, using the USB connector included in the Camera Kit ($30 for usb port and sd card reader). The 4.2 betas have already been tested with different external hardware.
He specifically said he's making the album on the iPad. Why doubt it?
I enjoy making beats with the KORG iELECTRIBE on my iPad but I doubt he'd be making whole albums on it
Video of KORG iELECTRIBE for iPad: http://www.youtube.com/watch?v=CeVx5PQERKE