Thanks! Bummer...especially since the 500/4 IS MkI is now officially discontinued, and not available from retail outlets anymore. IIRC, the exact same thing happened with the 300/2.8 IS II and 400/2.8 IS II - d/c'd the MkI then the MkII was delayed several months.
Makes one really question 'soonish' - even if we see a prototype 'soonish' the announcement will be delayed, then the announcement will occur but the release will be delayed, then delayed again. C'mon, Canon, get it together! If they don't have the 500L and 600L II lenses in peoples' hands in time for the Olympics, they're going to take a big hit.