Of course, the technical answer to your question - can you target it from Visual Studio projects - is yes, since the Xbox Development Kit (XDK) integrates with Visual Studio and that's what professional game studios use to build Xbox 360 games. But that's not a reality for the "rest of us" unless we work at a professional game studio and have access to the XDK's.

The "rest of us" answer would rely on them making this available via the XNA Framework, and the Xbox 360 team keeps that kind of stuff under pretty tight wraps. If I had to guess (and this is purely a guess, as a gamer and observer, not as a Microsoft employee since I know nothing in this space) I would assume that the XNA team is looking hard at Kinect to see if it makes sense to introduce into XNA Game Studio, but the reality with these sorts of things is that until they make an announcement it's anybody's guess.

I for one am hoping that they bring it to XNA. It sure would be fun to build games, and non-games alike, for Kinect!

Brian