The problem is that if OS4 is available for Pegasos then Eyetech is out of business. Nobody is going to pay almost twice the money for (in my opinion) inferior hardware to do the same job. For this reason there is no way that you will "officially" see OS4 on the Pegasos. Unofficially, of course, is a different matter.
The only reason people are buying A1's is that they want to run OS4. Take away that reason and its bye bye Eyetech.