just watched the 'prequel' to next week's episode on the BBC website....wasn't that character also in David Tennant's final show? Seem to remember him chatting to River Song in a bar/Star Wars 'Cantina' style setting..... Wonder if he'll play a bigger part next week or whether he just gets into that blue make-up to act as an expository device when required!?
no, he wasnt in any of the tennent shows, although he is a bit like the duke of Manhatten, in new earth.
He was the baddy who provided River with the Vortex Manipulator, which the doctor wore when jumping back and forth during Pandorica/big bang.