We are in the process of building a house in Ontario. We are using 1" exterior insulation on the exterior. My question is should we should we be using a house wrap prior the insulation on the exterior? We are not sure as to what insulation we are using on the interior yet. Thank you.

Not sure I trust it, but a quick check in HEED 3.0 for some MI, USA data estimates $40/year savings. But your situation will be different.

"should we be using a house wrap prior the insulation on the exterior"
Short answer is yes. - install well and tape the seams. Also tape the seams on the exterior insulation.

why? Shouldn't the wrb be on the outside? How would you properly flash windows and lap them under the wrb if the insulation is over the wrb?

Window bucks around the RO taped back to the WRB, or set the windows back in plane with the sheathing plane and trim the windows out with exterior trim jamb extensions:

http://sustainable.cchrc.org/docs/REMOTE_Manual.pdf

Building Science recommends taping the window flanges to the face of foam, but that feels very risky to me. We recommend treating the building as if it would remain completely waterproof if it had no foam, siding or trim.

What is the suggested method for brick? If the window flange is taped to the face of the foam, this would be no different than osb... but if the flange of the window is set back in plane of the framing how does the brick finish out around the window when you have a couple inches of foam board? Would you build a 2x window frame/bucks like mentioned in the REMOTE website and having the brick over the 1.5" face, then either install an exterior trim extension or wrap with aluminum?