Firstly, sorry for the lack of updates; we really wanted to have something to show you all rather than just our heartfelt apologies so you'll find some early test-shots of the subtitles in action during the Arrange Mode below.
But first, sorry everyone: the release has had to be pushed back until this spring. The development team is only small and they're hard at work updating the game, more DLC and on top of that, the need to go back into the original code and add subtitles timed to the on-screen action has been a lengthy process.
So, without further ado: here's the current screens from the PS4 version.
Each character has colour-coded subs and they can be switched on/off too.