While I still can't put the KPB stage stage from CFN2Beta to the main game, I found another new stuff. The LVS stage is also updated. The background NPCs (not the crowds though) have new animations and react to whatever we are doing during fighting. So guys one again, enjoy the early access to new LVS stage before it get released officially later.
Shown above is when in winning round pose, Don Sauvage (the ring announcer on the story mode) will grab some coins from his hat and scatter them around, also the two bunny girls will put up a magic trick by making the pigeon flies out of their hats. For more screenshots, see here http://imgur.com/a/nkPwl
Here is a gif animation to see some changes in LVS stage from CFN2Beta: https://gfycat.com/ArtisticAcceptableDrafthorse (both thanks to Firkraag for making it)
Here is a gif animation from the main game version for comparison with above: https://gfycat.com/ImperturbableGlassAsiaticmouflon
NOTE: Like the AFB stage, I only test this mod in training and versus mode, both work fine. But I haven't tried in online matches, it should work fine too imo.