Amplitude developer Harmonix Music Systems released the first gameplay video of the rhythm title last week, and although the clip contains off-screen footage, it offers a good look at how development is coming along.
Harmonix showed a playable demo at a private event during PAX Prime 2014 in Seattle a month ago, and according to Amplitude creative lead Ryan Lesser, some things have changed since then. Most recently, the developers tuned the timing, speed and camera to be "close to exactly" like the original Amplitude, which was released in 2003 on PlayStation 2.
Harmonix doesn't yet have Amplitude up and running on actual development hardware, so Lesser was playing the game on a computer with a PlayStation 4 controller. The game is being made on PlayStation 3 and PS4, and is set for release in March 2015.