I could be way off base here, but two things have pointed me into asking this question. 1. This picture below, notice no AP's higher than 3.
2. In the picture below, the vehicle markers list AP3, AP2 and AP1 dice only.
What does this mean?
I think that we might be able to make two guesses.
1. Armors of 4+,5+, and even 6+ just got more relevant. Flamers might not instant kill 5+ save guys. Wow!
2. AP3 weapons might be the only ones that can hurt vehicles? Or AP3 and all other weapons all have the same damage results, while AP2 and AP1 have different results. It is likely all weapons are being updated in the rulebook, but I'm not sure that it would only be AP3 weapons able to hurt vehicles. If so, the multilaser above couldn't hurt vehicles and I think that is unlikely.
I could also be very wrong and they may have just made AP6 weapons like the multilaser AP-. (this appears to be the case)
As more details emerge it seem that it is much more likely that AP1 weapons get plus 2 on the damge chart, AP2 gets plus 1 and AP3 and worse just use the normal damage chart, while AP - suffers no negagtives.
Since the multilaser was made AP 6 specifically so it could hurt vehicles, I'm assuming, are there any other weapons that will also chamge? Will Eldar Scatter Lasers lose their AP6? Could frag missiles, mortars and sniper rifles also see theirs disappear?