Helldivers 2 has recently received some interesting updates that suggest an underlying theme. One saw the buffs to flame-based weaponry, with the boosts to their power putting them in the spotlight. Another is the Chemical Agents Warbond, showing the potential of equipment that deals damage via toxic gas. Based on what's known, the next major update could have another theme of its own. However, there is no telling what it could be, but the probability of a particular one is high given what has already been covered by the game.