There was no way that they could come up, design, alpha test, beta test and release a new receiver in a 1 year timeframe.
Tivo told me this at CES so I am not surprised to see this news.
I personally would not be surprised if it did not hit the market until late in 2010.
Look how long the original HR20 took to come out from the time it was announced until the time it hit the streets. I believe it was over 3 years. (And when it came out it was unfinished many features of the box did not work and were gradually added over time)
I do believe that Tivo can make a great box for DirecTV, but great things take time to make.