Here is an email I got from tech support at Mad Catz:

Hello,
Unfortunately the answer is no. Currently there is no technology available to make blasters of any kind work for HDTVs or DLP Projectors. At the present time we do have some engineers working on the issue, but it will be some time before they can come up with a working model. If they have any success, expect to see something out there sometime next year. Keep an eye on our website for details. Take care

Jermaine Wright
Mad Catz
Customer Support Technician
That's too bad. I was really looking forward to HOTD3, but I won't buy it if I can't use a light gun.