Infomation from the BBFC website indicates the titles of four more stories due to be released on DVD in 2009.
From the First Doctor's era The Rescue and The Romans will be released as a double set. The Rescue is a two parter featuring the arrival of Maureen O'Brien as Vicki, while The Romans is a four part romp set around the court of the Emperor Nero. Both stories were first shown in 1965.
From the Sixth Doctor's era we have The Twin Dilemma which was Colin Baker's debut story, shown in 1984 and Attack of the Cybermen, first shown in 1985.