The Roli Seaboard is a new controller. Its an extremely expressive instrument/controller which allows poly pressure and poly pitch. Its not a low cost option but it does offer a large amount of expression to the keyboard player who needs that extra dimension.
The Seaboard GRAND, dubbed "The Piano of the Future" by CNN, reimagines the piano keyboard as a soft, continuous, pressure-sensitive surface. For the first time ever, you can perform on a standard musical keyboard layout while controlling pitch, volume, timbre and more - all in real time - without ever having to reach for a dial, wheel or knob. The Seaboard's polyphonic pitch bend, vibrato and per-note dynamic changes are all available at your fingertips, combining the intuitiveness of playing a traditional instrument with the versatility offered by digital technology.
We looked at the Seaboard Grand which is the most expensive model, but there are smaller units planned at more affordable prices, though again still not in the standard MIDI controller price range.