The A330s and A340s (both 343 and 345) will eventually all be replaced with 777-300ER and 777-200LR. The 767 fleet, some over 20 years old, will be replaced by 787s, with short term capacity needs being shouldered by "newer" 767s being brought in from KLM and Kenyan.
There are a number of press releases out there which discuss the reasoning behind the choice - suggest going to
www.achorizons.ca to check out the full story.