i wonder if slavery will be present as that was a major earner for the UK in those times.

main things id like to see

1.Arkwright, Cadbury etc.. economic as well as military figures (i always think the TW never focus too greatly on economy)
2.A big focus on the industrial revo if you are playing as the UK (i dont know how much it affected other nations but if wikipedia is correct it certainly made the Uk top of the tree in the 19th and early 20th century)
3.Basically a much bigger focus on economy but also (for players who just like the war) the ability to turn micromanagement of ur economy off
4.The ability to make laws and change ethics. this has been mentioned somewhere but id like to be micromanageable (with the option to turn it off of course) and for instance with laws the ability to pass health and safety acts for instance that would help the public to like you
5.Railroad
6.Major trade interface overhaul, with a much higher importance being placed on trading
7.Exploitation of the West Indies and Carribean for sugar, cocoa beans etc
8. And finally something i've always wanted to see in TW, when there is a riot i want there to be the option to go down to ground and control your troops against the rioters. i think it would be a nice novelty device to have within the game and probably wouldnt take too much effort