Most of the listed hopes I'm sure are going to be realized, some of them like drummers infact have been confirmed. The dreams I fear, won't be :(
I have always thought men would look distinct if they a few extra model insted of skins. I mean, it will make a whole lot of difference if the individual has the same uniform as the next one but is a mite taller. The formations would look a lot more realistic too then......I never understood why do they not have soldiers with difference in their hights or, their build......
Again, sharpshooters I doubt we shall see. Perhaps as a whole specific unit, but not interspread with others, the screenshots don't show any 'different looking' units in the columns of musketeers.
Of the fears, we have rocketships in there, and probably they'll be in use many times more than they ever were in reality.

My own fear; We won't have larger unit scales, the same old 200 men at the most on huge.
And that my computer will never be able to run this game anyway. lol.