MSN,
I think Boeing will likely push the B777s to AC... But I doubt AC can afford to bite.

I did dig around have heard that AC has options on 8 airframes from Airbus... Which could be A330-300/A340-300/A340-500/A340-600. ILFC also has orders for more A340-500s and A340-600s. These may be needed for replacements.

The B767-300ER will likely remain in the AC fleet for atleast another 5 years. AC does lover their B767-300ERs...

I was looking at the AC fleet of Bae 146s, B732s and B744s. They number close to 40.

10 B732s for Zip

~15 B732s for AC Jetz, AC Mainline and Tango

10 Bae 146

3 B747-400 Combi

3/4 B747-400s (Not sure if it is 4 as one aircraft was supposed to return in March)