Print out 90% of physics articles from the century. Get big trash can. Put printout in trash can.
Of course i'm exaggerating, but if the story is true, this is going to be big.
Speed of light is the main block for things like time travel and a hard limit on communication speed.
It doesn't matter that it is only 0.0025%, what matters is that it can be done(if it is confirmed). As a(very poor) analogy, the first CPUs were probably about 0.0025% the speed of the modern ones, yet look where we are today, in no small part thanks to them. The point is, if true, this may well open a whole new realm in physics, and who knows what we will find there.