They simply do not care, people are posting the same in Facebook and here, I have consulted with technical service, there is not an official statement. They are programmers, not researchers like us, they do not care about the citation plugins
Mendeley has already announced that they will have a plugin in 2 weeks, I guess we would need to migrate to Mendeley, because Thomson Reuters is not interested in creating a plugin and they do not even think in giving us a release date.