Yes. They only update the signatures and they improved the sandbox ( a little bit more active)
Other than that there is nothing new. Version 5 is still in beta and there is not any official release yet.
They focus on 360 Total Security, which is very good but not as ''finalized'' as Internet Security.
According to Manzai's tests Total security has failed twice to stop an unknown virus ''Kill Win'' but Internet security has blocked and deleted it at once.Another example is that both programs IS, TS, have the SAME detection in malware packs, even if Total Security has more engines (Avira).
My personal opinion is that if you like to install Qihoo on your machine, better choose the ''Internet Security'' version.
Merci
Mike