Hope that next Amp module is balance version and improved than Amp1
As it was mentioned above, the next AMP2 module is not BAL, but SE and it is an improvement over AMP1. If properly designed, you can make SE to sound as wide as BAL, and I believe iBasso mentioned about using high current architecture which can give you as much or more power in comparison to BAL. Of course, all in theory. Will find out soon once I get a chance to test it.
The only drawback of SE, I have way too many balanced terminated cables, so will have to use adapter with all
For me personally, I would like to see AMP3 to be geared toward IEMs (with both SE/BAL HO) and less power to improve battery life performance on the go!