The Terpstra MIDI Keyboard is a generalized MIDI keyboard with 280 velocity-sensitive keys. It’s designed for playing microtonal music, offering 55 notes per octave.
According to the Cortex site, its design is well suited for any MIDI-based application that requires a rich control surface.
It looks to be a design prototype – there’s no marketing info available at the site. If you have any additional info, let me know!