Every class is able to use two weapon categories, one normal and one heavy. Also, a secondary.

'Normal' primary weapons are the shotgun and the assault rifle.
Heavy primary weapons are the sniper rifle and the cannon.

Rangers can use the shotgun, the cannon and the sword.
Specialists can use the rifle, the sniper and the gremlin.
Sharpshooters can use the shotgun, the sniper and the pistol.
Grenadiers can use the rifle, the cannon and the launcher.
Scouts can use the rifle, the sniper and the holotargeter.
Infantry use the rifle, the cannon and the sawed off shotgun.

The weapons went through some changes, too. Some more, some less. The goal was making them mechanically unique and play significantly different than the other weapons.

Every class can pick between two weapons now, so the individual weapons can be more specialised to their job now. This was inspired by the weapons the faction classes in WotC use.