As far as i know - May is still on the agenda.. it really boils down to the venue... last years was a bit small and got SO crowded. Organisers are looking for a better and bigger one - if this cant be found then same venue it is.
 The deal is pretty much this.... if a bigger and better could be found - say a hotel where you could stay also but it was only available in June then event would be happening then.
There is honestly no more info regarding Expo other than this... as it happens it will be made public