Qatar would not be in T5 unless they joined Oneworld as this I believe is the BA and co. terminal. The likely scenario is that T3 will be in usage as it is currently undergoing a major redevelopment in wake of the airlines such as Emirates, Singapore, Virgin, Qatar etc who will use the aircraft to Heathrow. They are not receiving them till 2007/2009 anyway so it is still a long way off.

An Airbus order is of no surprise, though Boeing was also considered strongly. The A380 will allow further expansion in Europe with slot restrictions in the future. The A340-500 was also ordered as well? Just another example of the flourishing Middle Eastern carriers.