Good question.

We're almost done, although the development "consumer edition" of avast (i.e. avast home/pro) is now kind of a side job because we're trying to release the server and network versions as soon as possible.
Anyway, most of the stuff for avast 4.1 (or whatever name it will have) is already complete (the unpackers, the IM plugin, the P2P plugin, support for multiple SMTP servers in Inet Mail, Unicode support in resident protection etc.). There are some more things on the list, but not a big deal, really.
So from my viewpoint it shouldn't really take long, but there may be other things that may delay it...
Sorry for being so vague

Vlk