I'm really excited for prospects like this, I never like getting in vehicles, but I do love destroying them on foot, this will just add to my tool set. Speaking of destroying vehicles, the Mantis still needs tweaking in Halo 5, that thing ruined map flow, the inability to hijack it from the front made things worse. Map flow isn't a concern in Warzone where the lanes are large, but it could ruin BTB maps when those are released.
Mantis looks stronger than before. Much quicker and always shoots a barrage of rockets, although longer load times in between each shot I suppose. Probably won't show up till late game in Warzone tho, so the tools will likely be there to take care of it.