It is basically a preamp tube, very small directly heated wire cathode so that will have to be DC driven. The gain in circuit is 3.5 where a 12AX7 is typically 50. The max gains are 5 and 100 respectively.There's already product using it other than Korg.
Output distorts badly at 1 volt out and there is little current. I can’t imagine this entering any high end audio circuits, though it will be fun for the guitar players as it distorts and lights up.
The military has been experimenting with filament-less (cold cathode) tubes in integrated circuits (entire opamps done with cold cathode tubes) for several decades now.