It's not the amount of rare songs. It's the amount of songs period. LITS was usually about 31 songs. Even the festival shows were 20-25 songs. There's no way the arena tour is only going to be 19 (with one of which being pinion/eater of dreams). And it doesn't really fit his usual format with the theatrical middle part but its mostly the length.
And the LITS warm up show was almost identical to the regular shows so it stands to reason this would be the same.