To get troops to near the theatre for a major engagement? Possibly.
To get them to the battlefield? No.
As stated by most other posters, it may be chartered to get large numbers of troops to a neighbouring country or seriously in the rear of the theatre, but it simply does not have the survivability, nor the capability to land and turn around on semi-prepared airfields.
In addition (and as hinted at in earlier posts), there are few nations that could afford to lose 850 troops in one go and still wage an effective campaign. We need to remember that these won't be 850 grunts, but a mixture of standard infantry soldiers and specialists. The latter are not easy to replace. History teaches us well. In the Falklands campaign the 48 men who died on the Sir Galahad in Bluff Cove, along with many other injured, caused changes in the battle plans. However, they had a much more serious political effect back home in the UK and it caused a major political drive to be launched (far more than the 60000 casulaties on the first day of The Somme, 1916).
The western world seems to be able to cope with 5-10 soldiers killed every day, much in the same way as we accept 7 people per day killed on Britain's roads. However, 850 killed in one go and it could (would?) change the entire course of a campaign.
For that reason alone (although all of the military and engineering aspects are still valid), IMHO the A380 will not be used to transport troops anywhere near the battlefield.
The definition of a 'Pessimist': an Optimist with experience...