Bond Arms Bullpup9...based on the Boberg DAO design.
This thing looks like is has barely anything for a barrel but it is actually 3.35" because of the open-rear magazine...it grabs the next round from the back and pulls it back and up and just as the spent casing is ejected the new round loads the chamber. It is really a neat design that utilizes its space quite well and makes this interesting entry into the small concealable pistol market. Because of its rear-grabbing nature some ammo is better than others, fortunately for them the rounds with the best crimp is also some of the better ammo on the market for both defense (couple Hornady flavors, Federal Hydra-Shok, Speer Gold-Dot) and plinking (Winchester white box). And 7 rounds of 9-mil isn't bad for a small pistol, looks like it might fit in the hand nicely too and the recoil in the videos looks fairly tame. And I read the trigger is almost striker-fire like. It also uses a rotating barrel like the PX4.
Not sure if I would buy one, but a small 9 does have some appeal...if I ever come across one to rent I'll give it a go.