It's been renewed for one more truncated season (this will be its fifth and final year). IIRC, it will be for 13 episodes or so.
Actually lately ABC has indicated that they would be willing to extend the season should the early episodes do well in the new timeslot and even consider a 6th season. However I will have the re-look but I think BL is on a worser timeslot next season so it won't matter. BL will remain one of the best shows of all time.