Looks like team fortress 2, albeit with less hats.
I kinda got a feel of TF2 + World of Warcraft, at least for gameplay and art direction. The energy/magic effects, armor style, and voice acting were very WoW while the combat, classes, cartoony cell-shading, and gameplay looked very much like TF2. There's a damned Gnome building a sentry gun FFS.
I'd guess it will be one of those games that's poorly received (or completely flops) because it's really just a conglomeration of ideas from previously successful games and most players will get a strong feel of "been there, done that." Whatever happens, hopefully they can avoid the horrible micro-monetization that's poisoned TF2 but knowing Activition-Blizzard that seems unlikely.
I don't know about that. That is kind of Blizzard's thing. Taking good ideas from other companies/games, refining them and making them their own. Was Diablo the first hack and slash ARPG? No, but every H&S ARPG that has been made since has been called a Diablo clone. First RTS? Nope but Warcraft and Starcraft were very popular and made a large impact on the genre. WoW was not nearly the first MMO but certainly the biggest subscriber base and most well known. Almost every MMO since has been called a WoW clone.