iMPC (yes, that's right, the official MPC app for iOS) was well received across the board amongst users and reviewers. It is certainly a fun app, though lacking in a few "pro" features. Fortunately, Akai Pro and Retronyms haven't stopped there. They've been working on the iMPC Pro, with a scheduled release date of mid-Spring...
To date, we've been able to gather little snippets of info about iMPC Pro. First, Akai Pro suggest it'll be able to deal with 64 tracks and that initially it'll be iPad only. However, we've also found this video showing off the "Flux Link" feature in the new app.
We should be getting full specs on this beast of an app soon so stay tuned!