Nice stuff. A couple of the bits that caught my eye:

And in case you're worried that wily enemy players can sneak by your squadrons on their own turn, each fleet in this game projects a rather large zone of control and will have the option to intercept passing ships and engage them in battle.
Excellent, I was worried about how it would be possible to stop a one-turn naval invasion across the English Channel; so hopefully just having a fleet in one of the Channel ports should be enough to intercept an invasion.

You can even order artillery to fire on a fixed point on the map to discourage enemies from crossing a specific chokepoint or approaching a key objective.
Good, should hopefully make artillery more useful and less likely to spend the whole battle trying to turn to target a unit of cavalry.

or even slightly after our period like Waterloo
Bit odd, I thought the timeframe was 1700-1820, i.e. including Waterloo?

So if your army is fighting near a farm or a mine, the tactical map will reflect that with appropriate structures and backdrops.
Very nice.