Warhammer Alliance also have an excellent video here.
They discuss a lot of the mechanics like the ward system, lock out times and level bolstering. I am glad my mid level alts (25) will be able to get bolstered to level 36. But I wonder how many war bands will let you tag along if level 40's also want to join.
The new backpacks sound excellent they mentioned the Warrior Priest one which is lots of scrolls all staked up.