I found this preview for upcoming iOS app AudioLoopz. This is a 48-track looper looks a bit like Launchpad's layout, but busy. Perhaps a bit too busy. The description promises "powerful tools" are under the hood, so I look forward to learning what those are!
AudioLoopz the Flexible 48-Track Looper & Sequencer for iPhone and iPad ! Flexible drum and loop recording with powerful tools for fluid inspirational music creation ... Coming Soon!!!