According to this article it looks like the HDPC20 is going to be a no show this year and maybe late 2009.
"All the 'cool' features of Fiji were essentially held back so that there would be a 'compelling reason' for Windows 7 Media Center," the tester said. "Windows 7: Let's say best case senario is that it is released at the end of 2009. That means another year and a half until Direct TV can make use of its hardware. which is already a year old."
This is why I hate M$ so much.