The most recent issue of the Hill Times lists four Liberal MPs who are evidently putting out feelers to run for Speaker of the House (pending Trudeau notifying them whether there are any other opportunities in the works, i.e., parliamentary secretarial jobs or committee chairs; though I was under the impression the latter were to be elected by secret ballot). The four are:
1. Geoff Regan, MP for Halifax West (1993-1997, 2000-present)
2. Mauril Belanger, MP for Ottawa-Vanier (1995-present)
3. Denis Paradis, MP for Brome-Missisquoi (1995-2006, 2015-present)
4. Scott Simms, MP for Bonavista-Gander-Grand Falls-Windsor (2004-present)
The voting dynamics of this one will be interesting, particularly since there's something 200 new MPs, 150 of whom are members of the governing party, which you would think would tend to minimize the advantages of the people who served in the recent parliaments (good news for Paradis, MIA since 2006). All of the candidates other than Simms held ministerial jobs of assorted kinds in the Chretien/Martin period, though only Regan's was a full ministry.
You would expect that being bilingual would be an advantage for the candidates, which would help Belanger and Paradis, at least; I'm not sure what Regan and Simms' linguistic proficiency is.