<font face="Verdana, Arial, Helvetica" size="2">I also was told on another board that Matthew Broderick is leaving the show in November and not April but I don't know how reliable that is.
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The New York Daily News today reported that Martin Short is likely to take over for Broderick for six weeks "sometime this fall" while Matthew films a version of "The Music Man" for ABC (apparently a previous commitment). Short will also likely take over the role after Broderick's contract runs out next year.
Nathan Lane has indicated he would probably leave after the one year is up, but would consider returning to the show at a future point.
I was lucky enough to snag a single ticket for July so I should see the two originals.