Host: Rob (Microsoft)
Q: when will IE get transparent PNG support?
A: Ian, I'm sorry, I can't answer that question for you
Host: Brian (Microsoft)
Q: when / will there be the next version of IE?
A: As part of the OS, IE will continue to evolve, but there will be no future standalone installations. IE6 SP1 is the final standalone installation.
Later, Brian of MS says, "Legacy OSes have reached their zenith with the addition of IE 6 SP1. Further improvements to IE will require enhancements to the underlying OS."