Just the T5 itself is a godsend. I dont know about other things about bikes yet I still don't have my rule book but what this does is basically makes it so Melta and Las doesn't certify an instant kill on a Bike so Attack Bike Squads won't just die to 3 lascannon shots it will take 6 making them a much more durable squad to have. Putting say a Librarian,Chaplain, Captain, or Chapter Master on a Bike will mean that they can go up against Power Fists and Thunder hammers in close Combat without just popping from a single attack getting through which is the downside to most Space Marine HQs. Hammer of Wrath makes them slightly better at assault though not much. Jink gives them a 5+ cover save all the time basically a Terminatour armour invuln. They are Still Relentless. Turbo-boosting happens in the shooting phase so they can then change directions while doing it. so you can basically get where your going with a 3+ cover if you don't want to shoot something.
Bikes IMO are going to be the downside of Flyers. A Flyer can only move a 90 degree Pivot Bikes are going to have the speed to always be behind that flyer giving it nothing to shoot at while Bikes focus on the rest of the army or take potshots at the Flyer from a Safe Position.
Artillery is going to be Tougness 7 have 2 wounds and a 3+ save meaning that its not treated as a vehicle giving it cover saves. Wounds are done the same way as regular units so you put the gun up front and its going to die before your squad but your denying victory/KPs when the gunners scatter. Techmarines Bolster Defences also work on ANY cover now making Thunderfire cannons a more durable survivable model than before.
I love these small things that changed they may not seem like a lot to the mainstream but I like it
.
