I posted yesterday that the A-380 will be cancelled by next summer. Singapore and Emirates are NOT happy with what they see, and Boeing is prepared to toss them some 747's for almost nothing if they put a stake through Airbus' heart.
This is the most damaging news on the A380 yet. In all practicality though, I think Airbus will force the line for a decent-sized run, people will wait out the deliveries, and then if FedEx wants some - they'll pick them up cheap after someone else has already taken the initial depreciation.
I personally think that Boeing is ready to jump in with a 30 plane order for Singapore Airlines and 45 plane order for Emirates Airlines for the 747-8I if Airbus decides to kibosh the A380.