343i has talked about how Halo 5 will be ambitious and will be a big game. Being an ambitious campaign it could have big battles and stuff we have never seen before! I wanted to share some possible battles that could happen or are just an idea:
Grizzly battle(s): The grizzly is like the scorpion tank on steroids. The only time we have used it is in Halo: Spartan Assault and Halo Wars I believe. If you have drove the grizzly or command’d one imagine driving one in Halo 5!
The Sparrowhawk: The AV-22 Sparrowhawk is a pelican-like air vehicle and just seems badass. What if this could be the UNSC air vehicle to appear in Halo 5? Or at least pilot it in Halo 5’s campaign. I’ve always imagined piloting this and i hope i can someday.
Pilot, Driver, and Hiker: What if in one mission we could start out killing enemies with our team, then have a warthog part, possibly drive to some phaetons, phantoms, or pelicans and the procceed the mission from there. After that you could land your air vehicle and finish the mission. This has always been a dream mission.
Any other vehicles or universe stuff that could make Halo 5 ambitious are really good ideas, such as the Shadow (Halo 2), Scarab (Already confirmed not available in H5 but you get the point), pelicans/phantoms,the prowler, or that one vehicle that i personally love: the Kestrel. Also maybe a POV of dropping down to the surface in an ODST pod and getting out and fighting.
I just wanted to discuss Halo 5’s ambitious…ness because this game looks awesome so far 
Grizzly https://www.halowaypoint.com/en-us/universe/vehicles/grizzly
Sparrowhawk AV-22 Sparrowhawk | Halo Alpha | Fandom