We can’t say for sure because it doesn’t exist in public beta yet…

But, from what I understand, A4 will show up as a plug-in, not an audio interface.
However, you will be able to route channels 1, 2, 3, 4, mix L, mix R, and input L, input R. to any channel in your DAW.

In other words, you’ll be able to hook your iPad’s audio output up to the external input on A4, and input that into your DAW. (But not going in as an “audio interface”, but rather as audio coming in via a plug-in).