Looks to me, they don't sent a detailed overview, because it's not (yet) available. This in turn suggests, they just hope to be able to book a "cheap" ticket for you by that time. And if not possible, you get back your money (fingers crossed on that), though anyway, this gives me the impression to be a business model, where they take the profits and dump the losses on the customer (of course, with a huge amount of polite apologies, maybe offering an alternative, where you -take it or leave it- are offered to fly on Air Mozambique, with a 48 hours stop-over in Africa).