[telefan]

Here:
"The iconic Big Brother eye has been redesigned to what has been described as a "centrifugal inter-locking RGB rainbow test card"[11] by its designer Daniel Eatock.[12] He had also confirmed that this year's logo "has a very special meaning that will be revealed come launch night",[13] however, no official confirmation was made. Although there was no official confirmation, insiders working at Big Brother revealed the secret meaning of the Big Brother logo. This year, on the show's titles and other teasers, the logo is seen rotating many parts of its eye. The insider revealed that the rotating parts represented secret rooms in the Big Brother house which will rotate.[14]"

The rotating rooms theory seems to be real!