The first up is fast scroll. This rendition of fast scroll SHOULD be a bit more consistent than the old one in 2.0. There was a random bug that was very difficult to reproduce that would cause the letters to not match what was showing on the screen. The fast scroll code is much simpler this time around so i dont expect that bug to be an issue. The video is a big laggy and the fast scroll in general is not as smooth as i'd like it to be, but that will be worked on once 3.0 gets to beta.
The second feature is the addition of gestures. All the previous gestures have returned (swipe left right up down / tap / double tap / long press) plus I added in a few more. New gestures are 2 finger tap/double tap/long press, and a 2 finger pan. The pan is considered a "continuous" gesture, so there will only be a few actions that you can bind to it. The video shows it bound to adjusting the volume, but the other options would be adjusting tempo or seeking the track. If you decide to not use the pan, you will be able to use 2 finger swipes. Right now GMMP is using the stock version of the gesture library and it works fairly decent for the most part. If users find some gestures hard to use I will try to tweak the library to improve that.
My next 3.0 post on here will most likely not be for another 3-4 weeks since I have a vacation coming up and I plan on doing a 2.x patch for android O plus some other bug reports i've gotten over the past few months.