Howdy-
I'm the Chinese history guy from the prospectives weekend. My potential advisor e-mailed me on Feb. 25th to let me know that the final decisions in the department had been made and that I had been accepted. However, I just received the official letter from the Graduate School the day before yesterday.
So as far as I know, all the decisions are made (have you been in touch with Prof. Goswami after the weekend?), but the official notification seems to be lagging behind the department's decision-making process.