I can't speak particularly effectively to most of the arguments he makes (short version: C-484 is not like any of those nasty U.S. Fetal Homicide Laws). If anyone else wants to, or to just blow off some estrogen, go ahead in the comments. But what I would be especially interested in is if anyone has considered the risk the bill would might pose for abortion providers (rather than pregnant women)?
C-484 refers to harm caused to the woman by a "third party" committing an offense against the unborn child by virtue of committing an offense against the woman. And whether or not an offense against the woman has been committed depends on whether the act was "against her will".
Could a woman decide retroactively that her abortion was carried out "against her will" and attempt to bring charges against her doctor?
You do read about this sort of thing on Lifesite: My Doctor Drugged Me And Took My Baby etc.
Update: Liberal MP Brent St. Denis has now introduced Bill C-543, intended to "counter" C-484 and fill in some of its loop-holes.