(The problem described in this post has now been resolved.)
Several attendees have reported a problem when booking their hotel rooms; they've been told that the conference rate is no longer available and offered a much higher rate. We're talking to the hotel to resolve the problem; if you're given a too-high rate, don't book your room yet and wait until we announce the problem is resolved. (That announcement will be posted here.)
If you've already booked, please wait for the announcement and then call Marriott to fix the problem; if that doesn't work, send an email to (pycon at python.org) and we'll use our hotel contact to change your reservation.
Here's what's probably going on. PyCon has reserved X rooms per night at the conference rate. For most such reservations, the conference rate is no longer available once X rooms have booked. PyCon's contract is different, though: we get the conference rate until the hotel is full. The reservation staff was confused about this last year and they've probably gotten confused again this year.