I'm afraid if Jazz Jackrabbit 3 could exist once again as official new demo at least Epic Games might think that Arjan Brussee is not enough to revive Dean Dodrill's vision of Jazz jackrabbit 2 sequel. They probably need old crew they left Epic Games:
Cliff Bleszinski(he's still staying at Bosskey Productions),Alexander Brandon(he's upsent),Robert Allen(he's upsent),Dean Dodrill(he's still staying at Humble Hearts),Nick Stadler(he's upsent).I think they are not interested in Jazz Jackrabbit anymore. Maybe they could be a only one hope for future of Jazz jackrabbit.