New Harry Potter

Bloomsbury have revealed the cover (or two covers if you want to be pedantic, since there is the now-customary 'adult' cover as well) of the next Harry Potter novel, due for publication on 16th of July in the UK, although the main plot details of the boy (teenager?) wizard's new story - the Half-Blood Prince - remains a secret. I wonder if publishers should produce two covers for other fantasy novels? One for those proud to be geeks and others who want to read good fantasy but are scared of anyone else on the bus seeing them read it.