Building on what Killing_You said, we want to offer something a bit different from the other W3D titles, and are intending for GZ's gameplay to be a bit more tactical and less "spammy". What exactly this entails is still largely up for debate, but in general you can expect longer combat ranges (likely up to several hundred metres!), more realistic (to an extent) weapons/vehicle handling (damage/RoF/reload speed, ballistics & shell drop, APB-style first-person vehicle cameras instead of the usual third-person ones, that sort of thing), and more "high risk, high reward" gameplay. Your decisions will play a larger part on the outcome of the battle, and you'll want to carefully consider what sort of equipment you bring to the fight, and what you spend your credits on; For example, a tank could be an excellent investment in an open environment where it can shoot at enemies 300 or even 400 metres away, but could be a liability in an urban environment where enemy Rocket Soldiers could very easily ambush it, and the terrain will play a big factor in what weapons/vehicles/tactics work best.
Of course, as Killing_You said, large-scale classic tank rushes can certainly still happen; They just won't necessarily be the most effective tactic in every scenario. While tanks can be devastating in open country where they can fully take advantage of their long-range cannons, tanks tend to do poorly in heavy forest or in urban areas due to the limited mobility those kinds of areas impose, and the large potential for ambushes. In these sorts of environments, infantry and even light vehicles could very well have the advantage over tanks and other more cumbersome vehicles, even though the tanks may be significantly more powerful "on paper".