Back onto the Tactics side...
The Rhino rush of old has gone but there are still several uses of vehicles either:-
a)rushing forward in turn one to maximum distance (and for the Blood Angels with the new Fast Vehicle Turbo Charge Engine upgrade thats a long way) and popping smoke, then disembarking and fighting from there whether youve just dumped a heavy weapons squad or an assault squad in your enemies lines its still a pain in the butt
or
b) sitting back for the first 4 turns letting the enemy come to you and picking them apart then rushing forward in the last turn or two and grabbing all the objectives with your squads in the vehicles
or
c) Mobile Fire-shield/Herding the Enemy, buy as many transports as you can and speed them forward without any passengers, they then park up in strategic places on the battlefield and dont move-either blocking lines of sight or block routes of access and because the enemy cant move within 1" of it unless they intend to assault it they have to deal with it-Or actualy advance behind the Vehicle as again if the enemy want to get to you they have to take the vehicle first then you can get the counter attack in (hopefully)