I never really worry about pissy tensions within the band.
A. There's no way of knowing.
B. One would think that the band is professional enough not to carry it on stage, at this point.

As for the sets, I think it's a semi-legit concern.
I think both Sarnia and Detroit will be standard, though I think that will include Always, and possibly the one song rare slot (where DC and I Believe were played at Twick) Now, I think the Garden shows will get some of the rare Euro songs, since it's being shot for DVD, and the last shows of the tour are usually somewhat special. That back-carries to Boston, which may prove to be a "dress rehearsal" for the DVD. As for Central Park, i think that will be a hit-heavy show, but hopefully will get a cover or two (Mrs. Robinson, Bridge Over Troubled Water, Imagine).
All we can do is hope at this point, but I don't think the first two sets will be any indication of the next five.