Yep, apparently in this link: http://www.modern-combat.net/new.php?post=20121122160721
Vehicles are mentioned by 148apps.com!
I'm very impressed by hearing this!
Here is what was said for Modern Combat 4: ZH.
[The multiplayer aspect of Modern Combat is one that is like none other. Jeff Scott from 148apps.com describes this experience in an article saying,“The mulitplayer is where this game really shines. The number of hours that can be spent there is pretty much endless. An amazing array of unlockables, customizations, power up, vehicles, weapons, and multiple play modes seem to go on forever.”] Altough Vehicles might mean Milltary Support.
And also the second Sub Machine Gun might have been annoucned!
Check the secondary slot.