The 24-70mm Sparkles Around the Glass
I’ve seen a couple of threads now that talk about a sparkly bunch of detritus around the inner black ring (between the first and second element).
I looked at mine and it’s there too, but I’m certain that it’s simply the finish put onto that area of the lenses, it definitely doesn’t appear to be anything negative like dust or metal shavings, etc.
I took some shots though and this appears to show it the best (click for large version):

I’ll eat a potato if this is a problem though. I think people are being a bit over-concerned about their new, expensive babies– can’t totally blame them though.