They've never touched it since. Couple of Alternate Media stories have tried to deal with it (novels state it was all an elaborate, Chameleon Arch trap set for the Master by the devious 7th Doctor). But, at the most, RTD had Doc 10 state....point-blank, when dealing with Donna's metacrisis....that there canNOT be a half-human/half-Time Lord. Of course, looks like The Moff might be counteracting that with River Song....