I visited yesterday morning, and pedestrians were indeed able to travel around the entire circumference of King's College Circle (wasn't true on Saturday morning). The entrance to MSB facing toward KCC was also opened, and you can now walk from the entrance on Queen's Park Crescent to King's College Circle through the renovated courtyard area. The south end of KCC and the east entrance to the underground parking lot (going west on Wellesley) still look very rough, so not sure that completion is imminent.