The case for certiorari could also be made that this case involves a key component of the ACA that affects millions of people in many states that will eventually get to the Court anyway. So, it would be better for all concerned to decided the case sooner rather than later.
The Court only takes about 200 cases a year, so they generally pick them on their perceived importance.
Bottom line is you really can't tell which way they are leaning just from the cert grant.
“Bottom line is you really can’t tell which way they are leaning just from the cert grant.”
We’ve been surprised before. With the last ACA ruling, for example.