I must say that I am facing this rule change with some trepidation. Mostly for the rumours about nerfing the Necrons gauss weapon ability. It seems that the ability to fluke a lucky vehicle kill via a glancing shot will be removed and the troops need to wear down a vehicle - one weapon at a time.
Ick. Yuck. Barf.
With the new rules vehicles like the Falcon will take 5 or 6 rolls of 5 or 6 to take down. That is a massive difference and I hope, but seriously doubt, that the point cost will be adjusted accordingly. The choice of high S weapons is pretty limited as I recall (codex not at hand), to the Heavy Destroyer and the Monolith.
I am yet to figure out what the effect will be on my growing Chaos army. But with the vehicle changes I expect something nasty to happen to the dakka predator I was planning. For reference a Dakka Predator (from Librarium Online):
Predator w/ AC + HB Sponsons + Havoc Launcher
Here we have the “dakka” predator. Capable of spewing out enough hot lead to choke a horse. This thing is usually seen running beside two of its AT brethren in larger sized games, the enemy should be so focused on killing the AT predators that this should receive little to no attention.
With the new rules, any movement over 6" will reduce this torrent of horse-choking lead, possibly making other units like heavy weapon Chosen or Havoc squads more useful.