It's always been a 4+ cover save for vheclies, and +5 for infantry thow. The rule says that infantry get a +5 cover save, and vheclies count as being obscured. It dose not give a specif save or anything to the vheclie. So since the main rule book says 4+ for obscured vehicles, that's the save you use.
I don't get why some people needed this FAQ'd, by RAW it's always worked that way.
The squadron thing is also another thing that was stright foreword IMHO, but I can atleast see why some people might it cleared. Alot of people see to get confused by vheclie squadron rules and cover.