Unlikely any time soon, would require almost a complete rebuild of the UI, not even sure you can compile GTK on iOS (My money is on NO, it is complex enough on OS X where there are far fewer limitations on the dev environment). Given the UI is probably 75-90% of the work done for Ardour you would be better off rewriting from scratch anyways at that point for a lot of it.
That being said having been using basic audio editors for iOS lately, they just do not compare to a multi-track DAW like Ardour honestly. Even the multitrack environments on iOS are an absolute pain to use compared to Ardour and not as powerful. There are some basic things I will tackle on iOS these days, I am finishing up a show I used it for a quick VO recording solution for instance that I could quickly record through an Apogee and edit with basic processing an upload to Google Drive to allow me to import into my playback solution. Worked decently for that, but even the single file editing is rough, basic things like a SPLIT command on a touch only interface are difficult, especially when you want to do it with precision (You ever noticed how fat your finger really is?)