In short for English speakers: Redirection is vital too to recharge your wirebugs in combat by reacting to attacks and because instead of charged dash he uses the escape dash which is the new skill to do full bursts with, mainly because it's faster and you do more DPS and because it makes you invulnerable. The new barrage is weaker than doing full burst with the Normal 8 gunlance. Rest of the skills he introduces are self explanatory, like load up and artillery and obviously eating for bombardier and having protective polish.