New buildings and hidden backyard?

Harrop at the amusement park website Parkz has posted aerial shots of the Big Brother compound taken last week.

The photos (below) show significant new construction around the backyard area, including what looks like a smaller separate backyard with it’s own pool. Could this be a Head of Household / FNL winner area or secret second house?

Inside the house we hear from production leaks the toilet will have a removable wall revealing a passageway leading to a hidden room or possibly the diary room. The toilet wall will be used to issue housemates with secret missions, rather than an obvious announcement for a housemate to go to the diary room.

Update: We have added third less blurry photo, which shows the main backyard does not seem to have changed much since 2007.

House from air 1

House from air 2

House from air 3

Thanks to Harrop, newman & Matthew