Impossible to gauge really. I was hoping to get the next iteration out this past weekend but sadly one thing after another came up and I got very little done.
I am thinking the next iteration will really be an RC for RC
In other words - most things should be pretty finalized with the next release (or thats how i am planning it). Then its simply bug battering time.
I guess in a nutshell its easiest to say 'sometime between now and next month'