I didn't see much chatter on here (maybe I missed it?) but did notice over at google product forums a number of reports that in former WMT indexed pages in sitemaps had a sudden drop. We dropped a HUGE amount around 75%. Thought I'd share in case some of us don't check the Sitemaps reporting as religiously as others. I figured many wouldn't notice until the Index Status tools updates (which it does every 7 days).
Barry S. confirmed with Gary @ Google that the drop of indexed pages around June 14th in sitemaps is a Google bug.