We have some new confirmations about TF3 set locations at Kennedy Space Center plus some new possibilities. Here you can read the article (posted by TLAMB):
http://www.collectspace.com/ubb/Forum3/HTML/004169.html
And now the sci-fi part.

"A shuttle launch pad, one of the crawler vehicles that move the space shuttle and the KSC Vehicle Assembly Building are expected to be depicted in the film, King said in a news release."
Now take a look at the crawler that they use in the Space Center:
This will make one huuuge badass decepticon. Right? I know it's most unlikely but who knows.

And here is a reference of the things they will depict in the film (launch pad + crawler + shuttle):