Why are there still wheels and land vehicles?

you still have wheels because a hover vehicle has some kind of displacement field that literally pushes waves of gravimetric energy to the floor that crush anything and anyone underneath them.... thrusters might move said hover vehicle but its that repulsion action that keeps it in the air, (this assumes your talking about an all terrain any environment type vehicle rather than one that utilises an air cushion) and you can literally take a big ass brick shape and make it hover (can be done today using magnetics as well to provide the anti gravity effect just look at maglev trains)

as to the guns they speak about that in the various ME games, they managed to make them unlimited ammo weightless guns but those created problems like the gun overheating and becoming a giant pyrotechnic, that enthusiast weapons only fire one or two rounds to make you the best shot around (and of course have massively amped up stopping power compared to other gear their size)

about the only thing I was surprised with in the entire ME universe was the lack of lazer /plasma type weaponry give how slug throwers operate in a vacuum or where gravity is changeable, you wouldn't want to be say on an asteroid and shooting whilst running /jumping in an infantry action because you pull the trigger and your catapulted backwards ...... sure your bullets fly forwards but only at half speed....

yet slug throwers would be perfect for atmospheric action in gravity, where the thermal clip idea would be perfect (and of course the top of the line weaponry would get much better thermal wear out of the clip packs, rather like the n7 gear does)

lets hope that ryder comes with a full load out of N7 weapons and improved jump attack armour capabilities over what the truians developed in me3

as to the whole guns o nthe mako thing, I was rather hoping to finally see an m29 grizzly would be in ryders arsenal as the tank of last resort

I think Heinlein wrote a story where something like that ended up happening...

Man I definitely hope we get some sweet paint job options. I definitely imagine the Mako version was made for this trip or was a non-weaponized off-shoot that already existed. Just makes sense it would be a variant on an existing vehicle, cheaper to develop that way (in realsies) then going completely from scratch.

They've mentioned customization, really hope we get to see how customizable it is whenever 'soon' ends up being.