As you probably know, Joomla! 1.7 was released last week. The second day we tested our Joomla! 1.6 Integration Kit and it worked like a charm with Joomla! 1.7 .
So if you want to use AVChat 3 with Joomla! 1.7 you can use the AVChat 3 Integration Kit for Joomla! 1.6, but without the support for JomSocial and Community Builder.
We will announce here and on our forum (dedicated topic for Joomla! 1.7 Development) when news are coming on the way.