As has been explained in several threads already... Alwil has chosen to spread updates for the application itself (not the virus database!) over a week. This dicission has been made to spread the load on their server. Basicly it comes to this: I get the latest update right now, and you get the same update later this week. (or the other way around)
Wait 7 days, and if you haven't got a update after that, than start to worry