Wouldn't Virgin's 'agreement' to stick around until 2013 be binding on them at this point? I would think that they have a right to get out now if they wished, due to the delay(s), and they have chosen not to do so.
Translation: We're going to sit back and see if this lemon is really all that Airbus claims it is. If the program is still going in 2013 maybe we'll buy some.
Singapore Airlines owns 49% of Virgin. What if they buy all of the slots Virgin has for firm orders for the A380. Virgin could convert their options to other planes like the new A350XWB without having to take delivery of any A380's.
My point is the A380 might tank by then.