The PM would have the best estimation for when and he is offsite this week.
To quote Denny from a February 08 post-
Drid:Also are there plans for a 64bit version of Orion?
"I'm sure we'll eventually do that, but it's not on the roadmap for the next 18 months. And you should be wary of any product manager who claims to tell you about what's going to happen beyond 18 months--especially if the PM seems to believe what he or she is saying. "