The first real screens of DS Line Rider show a game with more visual detail than the original, in that there is some visual detail. In this snow setting (they might all be snow settings? It is a sled game, after all), it appears that your drawn lines create an actual landscape that your rider follows.

You'll draw your line on the bottom screen, and then it will move to the top when you play, so you can control the playback on the touchscreen. Also found in the screens is an interesting tool that lets you alter a line by picking it up at a point and dragging it, which allows you to maintain a connected line.

However, the first video of the game shows the traditional Line Rider look in playback. Without knowing exactly what the deal is, we're guessing that you can preview a line before generating the snow, or that maybe you can change the game's look to a "classic" mode or something.