What do each of connection warning icons mean

BF4 uses a "smart lean" system. The beta is a bit buggy with it, but the premise is that when that pops up, you are by a corner and holding the ADS button will cause you to lean around that corner, exposing less of yourself to the enemy. The best way to see it is to stand at the corner of a wall and play with it. It takes some getting used to but once you do, it will feel smooth.

There are 6 multiplayer weapons you can unlock through the campaign. You can check them under Assignments -> Single Player Assignments. They are as follows:

TOMBSTONE ACTUAL (CAMPAIGN)
AWARD REQUIREMENTS
Complete Baku
REWARD
M412 REX

FANG OF THE UNDERWORLD (CAMPAIGN)
AWARD REQUIREMENTS
Complete Kunlun Mountains
REWARD
SHANK

A TRAPPED WOLF WILL (CAMPAIGN)
AWARD REQUIREMENTS
Complete Tashgar
REWARD
MACHETE

TO VALHALLA (CAMPAIGN)
AWARD REQUIREMENTS
Make the final choice
REWARD
QBZ-95-1

PEACE MAKER (CAMPAIGN)
AWARD REQUIREMENTS
Make the final choice
REWARD
P90

FINAL DUTY (CAMPAIGN)
AWARD REQUIREMENTS
Make the final choice
REWARD
M249

* SPOILER *

The last 3 require you to play the final mission 3 times, choosing a different ending each play through: kill Hannah, let the Valkyrie be destroyed, or kill Irish.