Ticket to Ride: Rails & Sails, which carries an $80/€70 MSRP, will debut at Gen Con 2016 in August, then be released in stores worldwide in early September 2016. Here's an overview of what's familiar and what's new in the game, with images to assist in the explanation. (The complete rules are available in English, French and German on the DoW website.)
As in other Ticket to Ride games, in Ticket to Ride: Rails & Sails players start with tickets in hand that show two cities, and over the course of the game they try to collect colored cards, then claim routes on the game board with their colored train and ship tokens, scoring points while doing so. When any player has six or fewer tokens in their supply, each player takes two more turns, then the game ends. At that point, if they've created a continuous path between the two cities on a ticket, then they score the points on that ticket; if not, then they lose points instead.
Similarly, players choose their own mix of train and ship tokens at the start of the game. To claim a train route (rectangular spaces), you must play train cards (or wilds) and cover those spaces with train tokens, and to claim a ship route (oval spaces), you must play ship cards (or wilds) and cover those spaces with ship tokens. Ship cards depict one or two ships on them, and when you play a double-ship card, you can cover one or two ship spaces. You can take an action during play to swap train tokens for ships (or vice versa), and you lose one point for each token you swap.