I leave for CMB in the morning. It's difficult to look at the news account and assess whether there is any risk. I've decided there is a high level of probability that I will be fine. (I am spending several days in Sri Lanka.)

Are you planning to visit the country, or just do airport turns? If you are simply doing airport turns, I think the risk is near -0- that CX or SQ or another carrier will fly in if they consider the plane and passengers to be at risk.

If you are planning to visit the country, I'd wait a week or two and see what news comes from Sri Lanka. Perhaps this will turn out to be analogous to the assassination of a leading politician in any country, which has no implications for the risk faced by tourists.