I'll say this: if Alex was correct and Rush do bust out a few tunes they have never played before (not counting new songs), as well as songs they haven't played in a long time, I hope they dig deep into the 80s synth era albums. Consider that since 1991, they have only played:
4 songs from Signals
3 songs from Grace Under Pressure
3 songs from Power Windows
3 songs from Hold Your Fire
Plenty of great songs from all of those albums that haven't seen the light of day in forever, if ever. The fact that Between the Wheels, Mission and Marathon were all resurrected on the last three tours gives me great hope that another deep cut from one of those albums will be played this, or maybe even two.