1. I don't believe shotgun was changed.
2. Arty was nerfed with the arcing shots, removal of screen shake, and removal of damage through buildings, plus MRLS buff. The Nod advantage should be gone now.
3. Snipers no longer have the reticle dot in the dead center of the screen, to discourage no-scoping.
4. I too disagree with vehicle>infantry. Splash damage from most tank shells was terrible, APC was hard to aim, etc. I don't think damage against vehicles was improved for any weapon, but you can now buy an Armor-piercing gun to replace your pistol, even if your barracks/HON is destroyed so this helps infantry vs. vehicles.