I have no information on this, but the cynic in me thinks this is likely a total non-story/spin. I find it unlikely anyone would be so confident a AI system that they are "planning to introduce" that they'd schedule staff cuts. What's more likely is that staff cuts were already planned. This puts a great spin on a (I would guess most likely free/cheap) experimental deployment of Watson.
This is a non story because insurance (and banking) replaced human workers with expert systems a looong time ago.
This is definitely an industry where more automation could easily be done, but the big insurers are a conservative, risk adverse group.