According to BNN, the LGW route (or at least the first one) will be out of YYZ. If correct, it's unfortunate that they're piling onto the route.. AC, TS, BA, ZX, and now WS. My guess is one of those 5 is not coming out of that route in good shape.
http://www.bnn.ca/News/2015/8/27/Air...mpetitors.aspx