I would think that AC would take the opportunity to rationalise the whole fleet. The DC10s and 737-200s would be first for the chop and will never be repainted in AC livery. The 767s probably stay on for a good while, although they are GE powered (AC uses PW on 747s and 767s).
I would imagine that both the AC and CP 767s would be replaced by A330s and A340s. The A340s would probably be used to replace 767s across the Pacific and the A330-300X could operate most routes across the Atlantic, formerly operated by the 767-300. The question is, what will happen to the 747-400s. AC now has seven and I would expect AC to increase its 345/346 order to account for these and the new routes for which it has applied.
Again, just my guess.