I wonder if I am the only one who doesn't like medleys of old Genesis songs? Those songs told stories, and performing just one verse or half a song means the story isn't told. I do like how they did just instrumental sections of FoF and Cinema Show in 07, rather than shoehorn partial songs into a medley. I still find the 1992 "Old medley" jarring when they stop part way through Dance On A Volcano.
Phil's voice seemed to get better and better on his recent tour, so once he's in practice again he should be surprisingly good. It actually sounds more full than on 2010's Going Back. But his mobility issues will make for a different Genesis show. Songs like Hold On My Heart will have an intimacy, whereas he won't be doing the old tambourine dance for IKWIL.
Regarding drumming, Phil has said that he can drum for 10 minutes at a time, but the stage show in the teaser didn't seem to have a second drum kit. Earlier rehearsal photos showed Nic's right handed kit and a left handed kit - presumably for Phil. Maybe he's decided he's not up to it yet? Or perhaps it just hurts too much. He's said that he technically could stand for a two hour show but it would hurt like hell.