SCOTUS has said that "all remaining decisions" will be announced at 10:00 Eastern tomorrow, June 26.
If you go to
scotusblog you will see the announcement immediately after it happens.
It is widely believed that Scalia will author the opinion. If you like prognostications,
here is one that you'll probably enjoy. Scalia is likely to give gun owners a big win, but unlikely to make the ruling binding on the states. That means that someone will have to go after the Chicago ban. Fortunately, that is widely held to be a gimme putt if we win tomorrow as expected.
Note the comments in the Scalia article about the AWB.