The search giant did not have an approximate date users could expect to see the feature added. The browser will also eventually have the ability to determine when a plug-in is being run under suspicious circumstances. When a plug-in is rarely used, it's activation could be a sign of malicious behavior. Chrome could be able to take not of this and notify the user.
Chrome has a beta and developer build channel, so we're likely to get some warning before this feature hits the majority of users. The changes don't sound too intrusive, and we like the idea of all our plug-ins being kept up to date automatically.