According to a report on BBC News Online, 'Queen' (most likely Brian and Roger with session players, as usual) are to join stars such as U2's Bono and Beyonce Knowles of Destiny's Child in an Aids Benefit Concert to be held in Cape Town, South Africa, on November 29th.
http://news.bbc.co.uk/1/hi/entertainment/music/3210518.stm