Some photos and details/impressions:
-Game takes place 3 years after HOTD4
-Protagonists are Kate and Ryan, James Taylor's brother
-The style seems to build very specifically on HOTD4 with the uzi as the main weapon and huge hordes of zombies
-The location test has chapters 0 and 1; after chapter 0 it looks like you can choose a route in the full game but only one option is available for the loctest
-Difficulty for normal mode seems on par with HOTD4
-There didn't seem to be anything that restored life (pickups or rewards for rescues/good level scores), that may have just been turned off for the location test though. There are coins and stuff hidden in boxes (one had a top hat in it lol)
-The boss of chapter 1 is Chariot; Ididn't catch if they explained how/why he's back
-Normal mode has situational automatic weapon changes, apparently in "master mode" you can switch weapons freely, but I haven't tried it yet
-The first two chapters had a grenade launcher, shotgun & rocket launcher at various points
-The cab design is pretty cool, it's the standard sit-down style you see for shooty games lately
-The gun isn't mounted, gun design is similar to the HOTD4 gun and it has a secondary trigger on the front that didn't seem to do anything in normal mode
-There's a coolass lightup zombie on the back
-I didn't feel the various types of force feedback all that much? i.e. seat motion, air blasts, etc. - I mostly only felt them during the boss
-Good force feedback for the gun though
-The sound design is nice and there's an "explosive sound mode" you can toggle on or off (some of the dialogue was impossible to hear but what else is new for arcade games)
-The post-game survey has a question asking if you would be interested in a console port
edit: oh also, the voice acting is pretty bad, not HOTD2 levels but bad enough to satisfy me