Some days ago (March 29 to be precise) the developers introduced a new song mode: NEXT STAGE, or NEXT for short.
This mode still uses a lot of the typical button tapping that you're used to, but it also introduces two new ways to "tap": Flick and Swipe.
Flick buttons are the ones with the little arrows on them. The idea is simple: Instead of tapping them when they reach the tap area you flick them in the direction they're showing. Means, if an arrow shows left you flick to the left side instead of tapping the button. Swipe are little whirl buttons and work similar to the star buttons in the usual gameplay: You hold the note. The difference is that you end the note at a different button than where it started. You more or less "swipe" your finger from the starting to the end point, beginning from the first whirl, not being allowed to let go until the last whirl ends up on the ending button.
This new game mode is a bit more difficult than the original one, but maybe we'll get used to it.