thanks @urklang you killing it. i agree with whats been said in the other thread, most importantly we need to maintain software compatibility for now, and the same level of plug'n'play-ness. i think we can expect users to plug in a pin header-expansion board for eg. the midi outs, other than that USB and line/hp out needs to be immediately available and supported. also the GPIO pinout should remain compatible for now. love the idea of a split hp/line out. regarding 3.5 vs 6.3 mm, i think we should go with 3.5, but as @tele_player suggested, have a same-layout version of the board without the jacks soldered on, so more experienced people can hack their own wired jack format on it if needed.
one thing that just came to mind, would be awesome to have a stronger output amp to get to studio line levels (+4 dBu). possibly balanced output for a later revision, would need more connectors obviously.
i also like the idea of immediately jumping to H7 but i am worried that this would add a lot of extra developement time, and i think we should most urgently (or also...) try to just make something compatible available ASAP. so if the H7 update would add even 1-2 weeks to it, i would do that as a seperate project. to put it in the thread title words, mini first, next-gen second.