If it is a hoax, they would have sold lot shares when the PPS was better and would have closed down the show - I think it is the easiest thing that they can do.
Having said that, Since they are dealing with the Chinese govt they themselves r not clear inorder for them to give some dates. They were overly optimistic in the past and looks like they now have realised that they have to be lot more conservative.
However, the first PR about Inner Mongolia was uncalled for if they were not sure and this filing is indeed disappointing for the lack of any news about it. I always felt that news about it was put out a way bit too prematurely. They could have waited for few more months atleast.