This rumour is already going on for a very long time.
Fact is that the A300-B4 will be replaced one day or an other.
At the moment it is unclear what aircraft type will replace them (B767 / A300-600), it is unclear who will operate them (ACL / EAT) and it is unclear when this will happen.
They made most A300-B4's QC8 compliant, so chances are it will take a while before they are replaced...
Official statement is expected mid 2011 (so probably end 2011...)