Office Communications Server 2007 R2
cnet has this article - Microsoft plans unified communications update on their web site today.
Another link - Microsoft Unveils Microsoft Office Communications Server 2007 Release 2
I've been on a conference call this morning concerning R2 and I'll provide you with more details later today or early tomorrow after I have had a chance to distill my notes and write the blog post.
As I said before there are some exciting things coming.