Intro...I'm a Program Manager on the “Longhorn” SDK team and have been with Microsoft for a little over 6 years. My current responsibilities are the design of the publishing system for the “Longhorn” SDK (The marketing folks like the quotes, not me...) and the owner of the .NET Terrarium game. That's right, I get to help work on cool stuff like Longhorn and make games. Still trying to figure out how I managed to do that. :)
As for Terrarium, we are currently working hard to release an update that will include the complete source code to the client and server. This has been a long time coming, but we definitely are nearing the finish line. I'm pretty excited to see what different modifications the community will do once you get your hands on the source. Once that is done, we will dive deep into work on the Longhorn version, which I'm planning on making quite a few large changes both in the architecture and game play. I'm a hobbyist game programmer that finds 3D programming quite interesting, so combining that with some of the technologies like Avalon should make for some very cool results.
As work progresses on “T2”, I'll be posting thoughts on features, designs, etc. I'd love to get your feedback on what you want to see in the next version.