So the List looks like this so far (according to the media:)
Thursday evening Lorne Calvert announced that he plans to give up his role as leader of the provincial New Democrats, opening up the gates for a leadership race. Several names like former Deputy Premier Dwaine Lingenfelter, Frank Quennel [sic] and Pat Atkinson have been mentioned. None of them have committed to taking a run at the position. It would appear applications are being accepted. And, there's a caucus veteran that could be considered. Yes, the next leader could come from Moose Jaw, in fact from the same constituency where Lorne Calvert got his start. Moose Jaw Wakamow NDP MLA Deb Higgins might give it a shot.
This is the first news source (that I have found) to add Atkinson to the list.