Those are all links to tweets from official @Identityrpg twitter. Please note that everything might change before game's release.
SOURCES:
1. What weapons will be in Identity:
Shotguns, AK47, M4A1
Shotguns. MP5, AR-15
Handguns
9mm handgun
Police shotguns
Hunting rifles
Hunting rifles 2x scope magnification
Automatic guns
Automatic guns & assault rifles
Police explosives- smoke grenades, tear gas etc
Nonlethal -paintballs, rubber bullets, bean bags, tear gas, tasers
Meelee
2. What weapons won't be in Identity:
Swords
Suicide vests & explosive grenades
Explosives, grenades, C4 <- there's the exception @jcdock mentioned
Snipers
Snipers, long range scopes
NO SNIPERS
Tommy guns
HK 416
Throwing knives
Nuclear weapons
Military
Tranquilizer darts