The folks over at Wargamers@Nordalia have an interesting review up of the new plastic tread system Battlefront are using for their Flames of War tanks. The review contains a lot of very useful photos.
Personally I’m going to miss the older white metal treads. Sure they had casting issues and required a lot of clean up but at least they really weighed your vehicles down on the game table. A 15mm resin tank with plastic treads is going to weigh almost nothing which may or may not be an issue on the table, depending on how clumsy a gamer you are.
Mind you I still have an entire 1500pt German DAK Armored Company to paint, so it’ll probably be a while before I encountered the new tread system first-hand!