Federal officials said the asylum seekers often arrive into Canada with legal visas from the United States, adding such facts will be considered in the determination of their status in Canada. The process will take between four and 12 months.
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My concern is that many of these folk will simply disappear into the cities of Toronto and Vancouver. Border Security has a less than sterling reputation of keeping track of these individuals. I doubt that they will remain in lockup for the entire year or so while their stories are verified. 

If they are returned to the USA, great. I just doubt that the Americans will be all that ready to accept these people whether they are refugees or illegal immigrants.