Yes: the so-called "Public Sector Equitable Compensation Act", contained in the Budget Implementation Act (Bill C-10), will certainly be subjected to a constitutional challenge (as will probably the "Expenditure Restraint Act", also included in Bill C-10, which legislates wage increases).

The Act is truly atrocious. (This analysis explains reasonably well why that is.) The fact that the Harper government was so heavy-handed (in some respects) in drafting this anti-women legislation—by including fines up to $50,000 for unions who "encourage or assist [an] employee in filing or proceeding with a complaint under [the] Act", to cite one of the most egregious examples—will ironically be helpful to those who will challenge the law.