The Supreme Court heard oral argument in the partisan gerrymandering case in December. We do not know when the Court will issue its decision (it could come as late as the end of the term in June), but here is what we do know.
It has decided some of the cases on its December calendar (and some even on its January calendar), but Vieth and a four others still remain from the December calendar. The Court is expected to issue opinions tomorrow and Wednesday. Next Monday is the final possibility before a recess. If not by Monday, the Court takes a recess until April 19. See here.