FWIW, I'm pretty sure 2015 QHP selections just broke 12.9 million.
2018 MIDTERM ELECTION
Time: D H M S
The obligatory update. Assuming around 7,500 off-season QHP selections per day nationally, the grand total should cross the 12.9 million milestone sometime this week if it hasn't already, and should pass the 13 million mark at the end of July.
This won't likely have any impact on the currently effectuated number of course, which is likely still hovering around the 10.3 million mark due to non-payments and normal attrition, although some limited evidence from Washington State and Colorado suggests that this might be a bit higher--perhaps 10.4 million or so.