this few days ago, i have receive some new from asia, regarding replacement old 580ex ii.
base on this 580ex ii, it had already been market almost 3 year.
since last year nikon came out sb-900 flash gun, this flash gun beat canon 580ex ii spec a lot.
base on the gn sb900, nikon flashgun is bigger tha canon.
i suppect canon inc will come out something far better than niklon. but it just matter of time.
i heard it will lauch end of this year, this is what i heard from