I don't know. My POI finished to read my application files and replied to a mail I sent her in October asking if I'm still interested in the school or I had made other plans. It doesn't seem like an standard procedure. But who knows.
Regarding UPenn, I don't know when their visit days will be, but this week I'll be having an skype with POI. She said that the admissions process is still going on. I wouldn't expect decisions to be released before February 20th.
Each department has their own admission's process. But this is how Stanford's worked a decade ago: http://jackman.stanford.edu/papers/pa04.pdf
Congratulations! They didn't sent me details on funding. I've read they usually give between 25K and 27K. But in the informal mail POI sent me, they mentioned they have recently reformed the PhD program and now there is more funding.
Just received an email from POI in UPenn wanting to talk with me if I have any questions and still considering UPenn. She said their admission process is still ongoing.