Spoke to my WL manager yesterday afternoon. She said that she would not comment that the class is full, but that after taking into consideration R3 offers, she said that it "could" be approaching that point. Also, they are not yet at the summer waitlist point - based on her comments she said that they are waiting until the June 6th deadline to see who accepts.
Basically, it sounds like the class is almost full and that with the R3 deadlines, the class could be full. At that point, they will reassess the pool of candidates to see who will remain on the WL and who will be asked off the WL - that will be the summer WL. She also said the process is extremely flexible now - no hard and fast dates (as if there were before). She also basically said that there is no need to update the adcom, unless there is something material - and then they will certainly take that into consideration.