The PressPass announcement provides details of both the release of ISA Server 2006 and the ForeFront security product brand.
I'm really pleased that ISA 2006 has been released as I've spent quite some time implementing it in the lab and have found the new features to make life much easier. In particular that improvement in Network Load Balancing support and the ability to publish Sharepoint is a boon. I also like the improved web listener and authentication features that enable multiple web server certificates to be used for a single listener.
There's a Microsoft Forefront website that provides more information. Essentially the idea is to bring together our Microsoft's Security Products including the software acquired from Sybari, FrontBridge (Exchange Hosted Services) and ISA Server & Microsoft Client Protection.