Apple's announcement that this year's Worldwide Developers Conference will take place on 10-14 June came with a surprise forewarning that the tickets for the event, which traditionally sell out within hours, will go on sale on Thursday 25 April (today) at 10am PDT, which is 6pm UK time.Related StoriesAmazon plans own set-top box for autumn, report claimsMicrosoft to announce new Xbox on 21 May
