I don't think I believe it. Airbus doesn't yet have enough orders for A380 to break even, or even half as many orders as they need. Will they eventually get them, probably. But they still have to finish off all the odds and ends with that aircraft. They have to develop the A350 and make it attractive against what looks like a phenomenal competitor in 787, and they have to develop an A320 replacement. I don't see where the spare 25 billion in development cash comes from. Neither Russia nor Airbus has a ton of spare change to throw around on a huge gamble.
And right now, with $60+ oil prices, airlines don't care about getting there sooner, they care about burning less fuel doing it. A supersonic jet will never get the same fuel economy that the best subsonics get per passenger mile. As a result, the market for these aircraft will be small, certainly small enough they'd never turn a profit enough to offset the largest (by far) development cost of any civil airliner. Boeing had SoniCruiser, which would get the same fuel economy as 767, and move 30% faster. No one cared. They had that thing ready to go. They could revive it without much trouble. They never pursued it because of lack of interest.
"Let the world change you, and you can change the world"