I think WDADU songs and songs that heavily featured MP vocals will not be heard from much on Mangini's first tour with DT. That means he would have to likely learn the following songs as sort of a "master" repertoire:
I & W: All
Awake: All
ACOS: Hopefully yes
FII: HY, PS, LITS, TAMP, AL, TOT
SFAM: All
6DOIT: All except TGP, WIMH, TTTSTA
TOT: AIA, ES, SOC, ITNOG
OV: All except TROAE & NE
SC: ITPOE, FORSAKEN, TMOLS
BCSL: all except TSF & TBOT
That's about 60 songs that we could possibly see this tour, not counting the new album. Of those, there are probably 10 or 15 that we could count out based on their heavy rotation from the last 2 tours (PA, etc). So he'll need to have roughly 50 songs down pat by the time they start their headlining tours. This is my long way of saying I don't think they'll be WDADU songs.