"The 747-400ER is the fastest subsonic commercial airplane currently in service. Our Sonic Cruiser will, when it goes into service, will take on that title.".
NO IT WON'T !!!!!
According to their website, the Sonic Cruiser will only fly at up to Mach 0.98.
This is still less than half the cruising speed of Concorde. (M2.2).
:-)