Apparently, Neil De Grasse is to testify over the matter to Congress but NASA thinks the probability is .022%
0.022% chance it hits earth
30% chance it hits land and not water
149 million square kilometers of surface land and it will only take out roughly 2000 square kilometers ---> 0.001% chance it hits in any given 2000 square kilometer area
Compound those percentages with the fact that we will have weeks to evacuate any areas where it is anticipated to strike, and that leads to me not exactly losing sleep over this.
Thanks for posting it anyway, it was pretty interesting.