Acting Minister will be Mona Fortier according the Order-in-Council. Which I believe makes her Canada's first female Finance Minister.
But I expect, from what I'm hearing, its Freeland.
But one can never be sure of these things.....
The other logical Candidate is Duclos; who is second-acting Minister, and has the right CV for the job. (Economist by trade)
But I think Freeland is the more likely choice.
Freeland by the way is very much connected to former Bank of Canada governor Mark Carney......who has been advising the PM as of late.
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Some think Carney will be appointed (he doesn't have to be elected first, and could run in Morneau's seat).
That's plausible.