Luckydave14 - let the marketing directors decide what to do.

Having Bynes be billed above the title is a contract agreement.
And what they DON'T want is a duplicate of the Broadway production. That would confuse the two - which is the film and which is the stage show?
They need to (and are) distinguish themselves as a seperate film from the older film and stage production. I don't particularly like this poster, and yes it does remind me of HAIR - but I suspect this was just made up for ShoWest. Michael Bennett is right - most of the artwork displayed at ShoWest is used later across the country. But I've only noticed that with blockbuster films: King Kong, Superman Returns, Spiderman, Pirates, etc. HAIRSPRAY could become a blockbuster, but at the moment it's just a summer popcorn flick with huge names attached.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle