Based on this report from the insurance company side
http://healthpolicyandmarket.blogspot.com/2013/11/the-obamac... I'd guess that to date, 35 days in, the total is only a few thousand. Which is fortunate, because the insurers still have to confirm each enrollment, the report says some progress has been made in improving the quality of the 834 EDI transactions sent to insurers but they're still some distance from being trustworthy, "
[...] the progress so far is incremental and nowhere near enough to be able to go to high volume processing." (Fixing this is the #1 priority according to the new fix-it czar.)