It's about the size of a carno with a machine gun head, can easily take out dinos with its ranged attack. Stamina depletes pretty fast in turret mode, can go long distance running, can't regen when in turret mode (on dino) and seemed to be squishy against other velenasours (didn't have a saddle on). Very fun dino, like really fun.
Screw the giga. This is the most OP creature in the game. Pump all levels into stamina, damage, and health. They will literally kill everything in their path. I also recommend putting them on a quetzal. Boom. You get a legit badass fighter jet with infinite ammo.
Their ranged attack is bonkers, I went from worrying about every nearby predator, to gunning down everything I don't like.
They burn through Stam fast in turret mode, but they can run forever.
We won't know for certain if their melee damage increases their needle damage until the dev kit releases, or until someone shows conclusive video proof.
Tame one of these and have a blast.