3-4 seems like the obvious choice to me. It's also what the team will need to have in order to have any sort of relevance. If they can get more, that's not only gravy but could also keep them around .500 and/or in playoff conversations.
That said, I don't know how much of that will be sustained. There will almost certainly be stretches of sheer brilliance, followed by sustained mediocrity as these guys try to get through their first big league season or debuts.
I expect to see lots of fresh faces coming up from the minors. Some bigger names, some not so much so. Some will catch on and hang around, some will crash and burn and get sent back to St. Paul in short order. As @Sconnie has stated here and several other threads, there is going to be an innings gap and someone has to pitch those. It could get pretty ugly at times. It could be marvelous at times too though.