Actually CAL only operates the A340 now and regardless of what decision is taken, it intends to dispose of the A340, which is apparently considers too small for its needs.
No A330s are operated, so a new type could be introduced; SIA is replacing its A310s with 777s, so it wouldn't necessarily be unreasonable for 777s to replace A300s and the 777 would work as a multi-role aircraft: standard aircraft as A300 replacements and ERs for long haul flights. However, a combination of orders is still possible, with an order being split between A330s and 777s; no doubt European governments are lobbying fiercely.
Still, one can't blame Airbus for feeling pretty miffed. Still, EVA is expected to drop the 777LR (being the sole customer) and move back to the A340-500; it is already a 332 customer.