I hear the A300 s are being disposed of, the first one going at the end of this year
They are indeed. Fleet changes according to Jethro's are as follows:
One A300 to leave the fleet by the end of this summer, one by the end of next summer and the final 2 the year after.
All 757's will leave the fleet by the end of Summer 2014
One A320 to leave by the end of this summer.
Fleet replacement plans are expected to be announced later this year.