[rogeraabbccdd]

At least there's no new hitgroup in this update.
I make a simple plugin to test hitgroup.

Spoiler

PHP Code:

#include <sourcemod>

#pragma newdecls required

public Plugin myinfo =
{
    name = "[CS:GO] Test hitgroup",
    author = "Kento",
    version = "1.0",
    description = "Test hitgroup.",
    url = "http://steamcommunity.com/id/kentomatoryoshika/"
};

public void OnPluginStart() 
{
    HookEvent("player_hurt", Event_PlayerHurt);
}

public Action Event_PlayerHurt (Event event, const char[] name, bool dontBroadcast)
{
    int Hitgroup = event.GetInt("hitgroup");
    int attacker = GetClientOfUserId(event.GetInt("attacker"));
    
    if(Hitgroup <= 0)            PrintToChat(attacker, "Hitgroup: %d, NULL HITGROUP", Hitgroup);
    else if(Hitgroup == 1)    PrintToChat(attacker, "Hitgroup: %d, HEAD", Hitgroup);
    else if(Hitgroup == 2)    PrintToChat(attacker, "Hitgroup: %d, CHEST", Hitgroup);
    else if(Hitgroup == 3)    PrintToChat(attacker, "Hitgroup: %d, STOMACH", Hitgroup);
    else if(Hitgroup == 4)    PrintToChat(attacker, "Hitgroup: %d, LEFT_ARM", Hitgroup);
    else if(Hitgroup == 5)    PrintToChat(attacker, "Hitgroup: %d, RIGHT_ARM", Hitgroup);
    else if(Hitgroup == 6)    PrintToChat(attacker, "Hitgroup: %d, LEFT_LEG", Hitgroup);
    else if(Hitgroup == 7)    PrintToChat(attacker, "Hitgroup: %d, RIGHT_LEG", Hitgroup);
    else                    PrintToChat(attacker, "Hitgroup: %d, NEW HITGROUP???", Hitgroup);
}