Widescreen scaling is now handled much better. This is especially noticeable on ultrawide monitors, but it's an improvement for 16:9 displays too (Audiosurf was originally designed for 4:3). Most of the menu screens do still fully stretch.

Corkscrew twists were completely random, but now they highlight a big moment in the song. There's still the same 25% chance of a ride having a corkscrew (except for songs that really want one and therefore always have one).

You can now play in narrowscreen too if that’s your thing.

Have fun!
Dylan