I did not hear it, but someone said that a report on the ticket said Hensons locker was already cleared out.
Maybe they only announced it now because Henson was or already left and knew a reporter would find out and report it anyways.
That is the only thing I can think of really.
That they were afraid, for whatever reason, that someone would leak the story.
Remember when QC was cut how the reporters all knew something was up when QC did not show up in morning for the camp.
Now of course the reporters would not be in camp now but I imagine someone would still notice him, Henson, gone.
Other than that reason I really can not think of another unless they flat out know that a trade is in the bag or that Henson asked to be let go/retire.