Noip and aussie027.
Airbus has a MTOW increase of 4 tonnes to 573 tonnes in the pipeline. The first delivery is to BA followed by EK. Rumour has it there is a slight reduction in the range.
There is work being done on a further major A380 upgrade for possible customer CX who are insisting upon HKG-JFK capability without sacrificing payload. EK are also part of this project who are looking for DXB-LAX capability. The upgrade will include a MTOW of around 593 tonnes, more thrust, more fuel capacity, strengthening of the wings and changes to the fly by wire control laws to reduce flight loads due to the increased weight.
The wing dimensions will remain the same but there will be some major internal strengthening. You may recall the first A380 wing test failed to meet the certification requirement and further strengthening was required.
The current A380 is very 'heavy' with the EOW being over 100 tonnes heavier than the B747-400ER.