From Bloomberg (via the HW Video Channel), comes some news that will certainly be foremost on most mortgage banking professionals’ minds tomorrow morning: Lehman Brothers is already estimating that MBS sales dropped 36 percent in the soon-to-be-reported-on period. Be sure to pay attention to analyst mean estimates for earnings at Wall Street’s biggest investment banks. If they’re on target (never a given; after all, we’re talking about analysts), this would appear to be the quarter that the proverbial chickens decide to roost. Click here to watch the full clip, courtesy of Bloomberg.