If there is, I don't know about it. I also can't come up with a percentage from the demo installs. If it helps, I can say with absolute confidence that Dolphin 8 won't be released this week.
I don't think it'll come out in 6 months, either. I'm guessing early or mid-2013 at least, but without a full understanding of the state the code's in, I can't be confident with that estimate. But fear not, Dolphin 7 is still being maintained and these notes should keep people in the loop.
like,
1.Menu - 6% completed
2.Studio - 30% completed
3.Modules - etc etc
hmm... ignore me... its not gonna happen.. :)