i know anyone can change anything on wikipedia but this sounds like a good twist about the eye!
it said:
Logo
This years logo is a 'test card eye' for the simple reason that its a 'test', because on launch night, the eye will transform into a much more sinister looking eye, once the housemates are locked inside, then the fun will really start.
so the test eye is just like a teaser and the real eye will be reveald on the grand opening!
http://en.wikipedia.org/wiki/Big_Brother_2007_%28UK%29