Okay, so apparently you can get tothis area (that door leads you outside Aojiru's room, which is... creepy) from the new Library area, but I haven't found out how yet. There's a variable connected to the first book on the bloody bookshelf but I don't know what it does.
Otherwise the changelog doesn't show much. Wataru hasn't added more maps at all and in general there's only two new areas.