"Her character has more to do this time and is stronger but the thing Megan is most happy about is she's not nearly as orange. It's a big victory for her."Take from that what you will. It’s a second hand source to an overseas website so not sure how legit it is. Fox's lack of a tan is something that could be easy remedied between now and the film start date that is rumored to be May 17th in LA. I could care less either way. If wasn't TF3 related would not have even bothered to post about it.
Having said that, I imagine that a tanned look is easier to maintain consistency over the three months or so shoot for Transformers 3 especially since it’s a summer shoot in multiple sunny locations including LA and Africa. Dodging the sun and avoiding a tan would not be an easy task.