Google-backed Scvngr, the location-based service that sets challenges for its users (such as Guess the Missing Vowels perhaps?), has been hard at work in San Francisco setting up a game and tourist trek for the Google I/O annual developer conference, which starts on Wednesday.

Meanwhile, journalists have been hard at work on the challenge of guessing what Google might announce – with cars, televisions and frozen yoghurt providing big clues as to its Android ambitions. Read more