Matt posted on this somewhere earlier. Basically something came up to delay the delivery of the books. They have been pushed back to the first week of August, so you really are just waiting an extra week.
So, first week of August to distribution. I'd guess at around mid-August for the UK then after it's been delivered to the freight forwarder in NY, booked onto a plane, loaded onto the plane, flown to heathrow, unloaded, held up by customs, delivered to the distributor, then repacked and sent to stores.
All of which are out of Mongoose's control so I'm not blaming them, just making sure that UK-ers don't get their hearts set on the date published on the site and get hugely disappointed. Obviously we could be very lucky and theres space available on the very next flight, get waived through customs, arrive on the day the distributor just happens to have extra staff in, and be delivered to stores by Nigel Mansell driving a souped-up Parceline van, and then we all get a nice early surprise