As to the wireless keyboard, it looks to be sleeker than the current model - reminiscent of the thinner design of the new 12in Macbook. When will these devices come out? Probably next month, when we're expecting new iMacs to launch, or perhaps a little later in the year in the run up to Christmas shopping time. So if you were planning on buying the current Magic Mouse and wireless keyboard setup, it might be wise to hold fire for a while longer.
