Following a discussion in the Steam forums about Counter-Strike: Source VAC bans transferring to Counter-Strike: Global Offensive, it was decided to make a separate VAC ban list for CS:GO.
A forum post from last week saw a concerned user stating that he had a CS:S VAC ban over a year ago and recently updated his ban, meaning he was also banned in the CS:GO beta.
In the VAC support article it stated that a ban in one of the following games, would result in a ban for all games.
Counter-Strike: Source
Half-Life 2: Deathmatch,
Day of Defeat: Source,
Team Fortress 2
Counter-Strike: Global Offensive
The most recent reply in the thread is by ChadW, a person clearly associated with Steam, stating the following:
"After further review we have decided to remove the link between Source VAC bans and Counter-Strike: Global Offensive. The FAQ linked by heffebaycay has been updated to reflect this change.
Counter-Strike: Global Offensive is now a unique ban and bans in other games will not affect your ability to join VAC secure games in Counter-Strike: Global Offensive."
So any users with VAC bans in top four game titles on the list will not have a ban in Counter-Strike: Global Offensive, neither the beta nor the full game.