The latest version of the expansion (formely known as Bridges, Castles and Bazzars) has tiles with curved corners like the latest main game, also the graphics ont he tile is slightly updated and a few tiles have changed for example one now has a river. There are no longer any Bazaars but there are now Barns. which give an addition point for everyone's farmers Slight diffeence to castle and bridges mechanics.
This expansion includes
16 land tiles one of them with a river.
6 Bridges, neutral figures that can be placed on tiles as road segments.
6 Castle tiles, tokens placed on 2-tile cities to convert them into castles. They can be occupied by standard meeples to grant additional points.
6 Barn tiles, tokens placed at field corners that grant additional points to farmers occupying them.