I'm in nathanb's boat - I share articles with people within Reader, but I don't want those to be pushed to G+. Similarly, I don't want to be forced to read other people's links through G+.
And they said they said they are integrating the two better, so I'm assuming its possible for them can make the sharing between the two fairly fluid.
My bigger concern is the disconnect in sharing. Are they turning Reader into a one-way service, in that you share items to G+? It would seem incongruous to share things through Reader, but then have to go into G+ to see what other people shared.