I'm a little nervous about vehicles honestly. Has anyone gotten in testing yet?
Here's my concern. The game has already really pushed creatures. Been doing that for years. And vehicles are just an extension of that. They really encourage you to just run as many bodies as you can. Vehicles (not being actual dudes) dodge wraths and they turn any late game 1 drop (that would normally be a near blank) into a serious hasty evasive threat.
Are creature based strategies really having problems in the modern game to where this type of thing is needed? I'm ranting a bit but that was an honest question here. Speaking from my cube experience only, I don't think aggressive decks need more help dominating slower strategies. Like at all.
I may be overly optimistic, but what I think will happen in my cube (a mid-range speed environment) is that aggro will gain a notable benefit while control and mid-range will not be highly effected by the vehicle mechanic. (There is some value in the ramping ability of Cultivator Caravan to five color and ramp decks). Aggro benefits from the haste and stat boost that vehicles provide to smaller creatures that are quickly trumped by mid-range and control's threats and/or walls. Both points become exacerbated after a board wipe hits. But, I view that as a positive thing environments that lean towards mid-range and control provided you are looking to strengthen aggro (as I am slightly).
This is not to say that vehicles will adversely affect control. Most likely they will have a threat that can either trump the vehicle in question, instant speed removal, or the aggro deck may have overextended itself. Control can benefit from the mechanic early on by allowing their Merfolk Looters crew a vehicle defensively, but will not be able to use do so with the better offensive ones (e.g. Skysovereign, Consul Flagship). There are also better threats that take less work like the Titans, Massacre Wurm, etc.
Mid-range decks, depending on their speed, can fall under either the aggro or control arguments. Testing is need to be able to determine how vehicle will affect mid-range in a cube fully.