Leathality is the % chance a hit has to kill...it only works for melee weapons. Vanilla leathality is 1.
AP does not work of defense gained from shields.
Javs are less effective than in vanilla, though they can still be battle winners if used in a proper support role, you won't see infantry with prec weapons set to fire at will reducing an enemy charge to shambles anymore though.
Morale is sigificantly higher than vanillas, but closer to 1.5x than 2x, though it varies a lot depending on the unit. We didn't do anything so crass as simply double morale .