Already it has forecast of when goes to leave a new update the program after the 4.6.665?
Are you planning to post the same question every two weeks?
Why not wait for the post from Avast advising us there is a beta version?
Your gonna have to be patient and wait for the next beta release. 
If avast detects spywares, malware, adware, because in the site, where it shows the updates and which virus had appeared appear [ adw ], and does not show spywares?
Which are the improvements of version 4.6.684?
I recommend you read the topic in the link that Ylap has given you cause the answer is in there. 