Harmonix has stated that Amplitude will be delayed on PS4 and PS3. The title will now launch in January 2016.
“At a certain point, we made a major call: We’ve decided to double down, increase the project budget, and make the new Amplitude bigger and better than the scope of game we originally pitched to you all last year,” Harmonix boss Alex Rigopulos said in a Kickstarter update.
Source: Gematsu, KickStarter