DISPATCHER RPTS THAT LOAD PLANNING WAS LATE IN PROVIDING LAST MIN PAYLOAD INCREASES TO DISPATCH. CONTACTED FLT CREW AS THEY TAXIED OUT AND ADJUSTED FLT FUEL REQUIREMENTS TO ACCOMMODATE THE INCREASED FUEL BURN DUE TO THE PAYLOAD INCREASE.

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AT XA52Z I RECEIVED A MESSAGE ON MY SCREEN PRINTER SHOWING A PAYLOAD INCREASE ON FLT XXX. IT HAD ALREADY DEPARTED THE GATE AND WAS TAXIING TO THE RWY. I SENT THE CAPT AN ACARS MESSAGE INFORMING HIM THAT HIS FUEL BURN WOULD NOW INCREASE BY 3500 LBS AND THAT HE MAY NEED TO RETURN TO THE GATE FOR MORE FUEL. TSTMS WERE POSSIBLE IN THE DFW FORECAST AND I HAD ORIGINALLY PLANNED THE FLT TO HAVE SHV AS AN ALTERNATE WITH 45 MINS OF HOLDING FUEL. WE DISCUSSED THE WX AND DECIDED TO CONTINUE WITH THE FUEL ON BOARD. THE FLT WOULD NOW ONLY HAVE ENOUGH FUEL TO HOLD FOR 29 MINS IF DFW HAD ARR PROBS AT HIS ETA. A REVISED FUEL BURN WITH TIME AND INITIALS WAS THEN SENT TO THE CREWS ACARS UNIT. I CALLED LOAD PLANNING TO FIND OUT WHY THE PAYLOAD INCREASED SO MUCH AND TO FIND OUT WHY DISPATCH WAS INFORMED SO LATE. THE INFO I RECEIVED WAS THAT BWI STATION WAS ACCOMMODATING ADDITIONAL MIL PERSONNEL. LOAD PLANNING APPARENTLY WAS ALSO NOT INFORMED OF THE ADDITIONAL PAYLOAD UNTIL DEP TIME. PAYLOAD INCREASES ARE COMMON BUT A PAYLOAD INCREASE OF THIS SIZE SHOULD HAVE BEEN RPTED TO DISPATCH AT LEAST 15 MINS BEFORE DEP.