The instrument is called a "pipa".
http://en.wikipedia.org/wiki/Pipa
I went to the concert here in Victoria on Monday. I was on the floor right at the front and centre. Great concert.
I'm pretty sure they probably played the same setlist as they did in Calgary. Which is to say, a pretty mediocre one. Only one song from science, and probably the worst one (summer romance). Too many songs from light grenades (i'm looking at you kiss to send us off) and not enough from morning view (nice to know you/circles).
Kind of sucks when they don't play your three favourite songs (Green, NTKY, Admiration), still a good concert though.