From the Days of Wonder website:
The fifth volume of the Ticket to Ride Map Collection makes its debut in early October at the Essen Game Fair in Germany.
Ticket to Ride United Kingdom features two different maps on a double-sided board.
With the United Kingdom Map designed for 2 to 4 players, players will need to develop their technologies to be able to extend their network over the United Kingdom of Great Britain and Ireland during the 19th century. The double-sided map also features the board of Pennsylvania, a state full of railroad history where 2 to 5 players will invest in railroad companies to achieve victory. Check out the full announcement here.