Incorrect.
There’s two major ways the Tinker class could go; Mech-based, or Hybrid based. Mech based would be a character piloting a mech suit armed with an array of weaponry. This version would be largely based on the Tinker ultimate from WC3. Essentially you have a class that is physical ranged, yet is piloting a vehicle, sort of like Dva from Overwatch. In terms of size, you would have a Goblin/Gnome/Vulpera character go from its normal size, to the size of a fully armored Tauren or Male Draenei in full plate armor (if not slightly larger) inside mech form.
The other option is the hybrid, where the character uses the robotic backpack from WC3 and HotS. This version has the mech form as optional and only for the tank spec. The DPS and Healing specs use the robotic backpack with the robotic arms the entire time, with mech form being a cool down. The Healing spec in both cases would be based on the Alchemist hero.
Here’s a breakdown of the abilities:
Pocket Factory (WC3): The Tinker deploys a miniature factory that produces robotic soldiers over time.
Cluster Rockets (WC3): Launches a volley of rockets at a target area, dealing damage and stunning the target.
Engineering Upgrade (WC3): Improves your abilities and base stats.
Robo Goblin (WC3): The character boards a mech and pilots it into battle.
X-Plodium Charge (HotS/WoW): Launches a charge to a targeted area. After a few seconds the charge will explode, stunning any enemies in its radius.
Deth Lazor (HotS/WoW): Fires a beam of energy in a straight line, damaging all targets in its path.
Rock-it Turret (HotS/WoW): Deploys a turret that fires at nearby enemies.
Reduce, Reuse, Recycle (HotS): Your devices leave scrap. Retrieving scrap reduces the cooldown and cost of your abilities.
Grav-O-Bomb 3000 (HotS/WoW): Launches a gravity bomb that sucks all targets to it’s center and explodes, dealing damage.
Robo Goblin Shield (HotS): Reduces damage and increases movement speed by 30%.
Also you can add the Goblin Alchemist hero since it’s also a Goblin and tech-based, and forms the basis of the healing spec;
Healing Spray (WC3): Sprays targets in an area around the caster, healing them.
Acid Bomb (WC3): Throws a bomb at a target area, reducing the armor of all enemies in its radius.
Chemical Rage (WC3): Increases the Movement and Attack speed of a target.
Transmute (WC3): Turns a target into gold, instantly killing it.
Putting all of this together, you could have a DPS spec where a Goblin is inside a mech shooting lasers and dropping Iron Star rolling bombs, or you could have a Gnome with the robotic backpack healing allies with Healing Spray, and dropping a Pocket factory that deploys heal bots to shield his allies.
Again, completely unique and different than anything else we currently have in WoW. Definitely nothing like the Hunter class.