rsoman - the main problem is the weight of the aircraft. The weight of the aircraft is channeled down a few wheels (not sure how many the 380 will have) and the pressure on the concrete that the aircraft is on is huge - and I beleive that the load will be far higher than for 747 aircraft. Hence only a few airports can accept the 380, and those that can have all done work to strengthen taxiways and runways. Saying that I understand that LHR will have linited taxi routes for the 380, so ground will have a bit of extra juggling to do.
I rather suspect that a 380 would go straight through the surface of the runway at BOM. Even after re-carpeting its like taking off from a ploughed potato field
