I've walked past this poster for the last few weeks and thought it was a cryptic trailer to deliberately not show the film's title - Inglorious Basterds. I was expecting to see a reveal with the film's name. However, James Cridland's most likely hit the nail on the head here and said:
"What's missing from this picture? Ah, yes, the name of the film... couldn't have people seeing "Inglorious Basterds" now, could we?"
I'd love to know why the Tube thinks the word Basterds is so offensive. Specially considering the ad with the film's title is carried in Metro and thelondonpaper which are handed out freely at Tube stations.
I'm also surprised the distributors bothered advertising it at all if they couldn't use the film's title. Although perhaps they think Tarantino's name is big enough to not need the title as well. There might be something fun about going to the cinema and saying "Can I see that film with no name that I saw advertised on the Tube?"