Vehicles are in the campaign mode. That's all the previous hands on articles prove.
They've been in the campaign of every MC.
You climb on back of jeep, truck, whatever. It's an on rails element of every MC and Nova for that matter.
They are not in the multiplayer part of MC4. (Yes, I know their in nova 3 multiplayer before its pointed out by someone)
And no article has claimed they are as there are no multiplayer hands on from game sites yet. Yet.
148 may mention the array of options and customisations in the multiplayer and include vehicles in that sentence but they are referring to the drones/military support. Or they simply made a mistake.