if there is a halo wars 3 comming then there need to make it little beter then halo wars 2 since in halo wars 2 there are a lot off things missing and there have forget to do also.
firefight mode: it needs to have 2 maps for sure to play on also it and not forget the unint’s from the dlc’s leaders like hero’s are also need to be add in the haro’s wave and not only the basic hero’s only and also other units need to be add in the other wave’s.
units upgrade’s: there need to add more unit upgrade’s like it was more done in halo wars 1 but then add also for each leader there own end upgrade version like for serina units you can upgrade a hornet with ice effect or with the Kinsano that the end upgrade is for a hornet gets fire effect more and that for the other leaders also.
the multiplayer maps: there need to make better multiplayer maps with more space between each side like there have done more in halo wars 1 more.
the 3 vs 3 maps are little to small in halo wars 2 then it was back in halo wars 1.